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5*sin(a)^2+5*cos(a)^2+3 если a=-1/2

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     2           2       
5*sin (a) + 5*cos (a) + 3
$$5 \sin^{2}{\left(a \right)} + 5 \cos^{2}{\left(a \right)} + 3$$
5*sin(a)^2 + 5*cos(a)^2 + 3
Общее упрощение [src]
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Тригонометрическая часть [src]
8
$$8$$
       5         5   
3 + ------- + -------
       2         2   
    csc (a)   sec (a)
$$3 + \frac{5}{\sec^{2}{\left(a \right)}} + \frac{5}{\csc^{2}{\left(a \right)}}$$
         2           2/    pi\
3 + 5*sin (a) + 5*sin |a + --|
                      \    2 /
$$5 \sin^{2}{\left(a \right)} + 5 \sin^{2}{\left(a + \frac{\pi}{2} \right)} + 3$$
         2           2/    pi\
3 + 5*cos (a) + 5*cos |a - --|
                      \    2 /
$$5 \cos^{2}{\left(a \right)} + 5 \cos^{2}{\left(a - \frac{\pi}{2} \right)} + 3$$
       5           5      
3 + ------- + ------------
       2         2/    pi\
    sec (a)   sec |a - --|
                  \    2 /
$$3 + \frac{5}{\sec^{2}{\left(a - \frac{\pi}{2} \right)}} + \frac{5}{\sec^{2}{\left(a \right)}}$$
       5           5      
3 + ------- + ------------
       2         2/pi    \
    csc (a)   csc |-- - a|
                  \2     /
$$3 + \frac{5}{\csc^{2}{\left(- a + \frac{\pi}{2} \right)}} + \frac{5}{\csc^{2}{\left(a \right)}}$$
       5           5      
3 + ------- + ------------
       2         2/pi    \
    sec (a)   sec |-- - a|
                  \2     /
$$3 + \frac{5}{\sec^{2}{\left(- a + \frac{\pi}{2} \right)}} + \frac{5}{\sec^{2}{\left(a \right)}}$$
         5              5      
3 + ------------ + ------------
       2              2/pi    \
    csc (pi - a)   csc |-- - a|
                       \2     /
$$3 + \frac{5}{\csc^{2}{\left(- a + \frac{\pi}{2} \right)}} + \frac{5}{\csc^{2}{\left(- a + \pi \right)}}$$
31                             2   5*cos(2*a)
-- - 10*cos(a) - 5*(1 - cos(a))  + ----------
2                                      2     
$$- 5 \left(- \cos{\left(a \right)} + 1\right)^{2} - 10 \cos{\left(a \right)} + \frac{5 \cos{\left(2 a \right)}}{2} + \frac{31}{2}$$
                                           2              
                         /       2/a   pi\\              2
                       5*|1 - cot |- + --|| *(1 + sin(a)) 
    5*(1 + cos(2*a))     \        \2   4 //               
3 + ---------------- + -----------------------------------
           2                            4                 
$$\frac{5 \left(- \cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2} \left(\sin{\left(a \right)} + 1\right)^{2}}{4} + \frac{5 \left(\cos{\left(2 a \right)} + 1\right)}{2} + 3$$
                               2/a   pi\  
                         20*tan |- + --|  
    5*(1 - cos(2*a))            \2   4 /  
3 + ---------------- + -------------------
           2                             2
                       /       2/a   pi\\ 
                       |1 + tan |- + --|| 
                       \        \2   4 // 
$$\frac{5 \cdot \left(- \cos{\left(2 a \right)} + 1\right)}{2} + 3 + \frac{20 \tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}}$$
                   2                 
      /       2/a\\            2/a\  
    5*|1 - tan |-||      20*tan |-|  
      \        \2//             \2/  
3 + ---------------- + --------------
                  2                 2
     /       2/a\\     /       2/a\\ 
     |1 + tan |-||     |1 + tan |-|| 
     \        \2//     \        \2// 
$$\frac{5 \left(- \tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} + 3 + \frac{20 \tan^{2}{\left(\frac{a}{2} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}}$$
            2/a\             2/a   pi\  
      20*tan |-|       20*tan |- + --|  
             \2/              \2   4 /  
3 + -------------- + -------------------
                 2                     2
    /       2/a\\    /       2/a   pi\\ 
    |1 + tan |-||    |1 + tan |- + --|| 
    \        \2//    \        \2   4 // 
$$3 + \frac{20 \tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}} + \frac{20 \tan^{2}{\left(\frac{a}{2} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}}$$
            2/a\             2/a   pi\  
      20*cot |-|       20*tan |- + --|  
             \2/              \2   4 /  
3 + -------------- + -------------------
                 2                     2
    /       2/a\\    /       2/a   pi\\ 
    |1 + cot |-||    |1 + tan |- + --|| 
    \        \2//    \        \2   4 // 
$$3 + \frac{20 \cot^{2}{\left(\frac{a}{2} \right)}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} + \frac{20 \tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}}$$
                   2                         
      /       1   \                          
    5*|1 - -------|                          
      |       2/a\|                          
      |    cot |-||                          
      \        \2//              20          
3 + ---------------- + ----------------------
                  2                 2        
     /       1   \     /       1   \     2/a\
     |1 + -------|     |1 + -------| *cot |-|
     |       2/a\|     |       2/a\|      \2/
     |    cot |-||     |    cot |-||         
     \        \2//     \        \2//         
$$\frac{5 \left(1 - \frac{1}{\cot^{2}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{1}{\cot^{2}{\left(\frac{a}{2} \right)}}\right)^{2}} + 3 + \frac{20}{\left(1 + \frac{1}{\cot^{2}{\left(\frac{a}{2} \right)}}\right)^{2} \cot^{2}{\left(\frac{a}{2} \right)}}$$
      //   0     for a mod pi = 0\     //   1     for a mod 2*pi = 0\
      ||                         |     ||                           |
3 + 5*|<   2                     | + 5*|<   2                       |
      ||sin (a)     otherwise    |     ||cos (a)      otherwise     |
      \\                         /     \\                           /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\sin^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\cos^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + 3$$
                    2                        2
      /        2/a\\      /        2/a   pi\\ 
    5*|-1 + cot |-||    5*|-1 + tan |- + --|| 
      \         \2//      \         \2   4 // 
3 + ----------------- + ----------------------
                   2                       2  
      /       2/a\\      /       2/a   pi\\   
      |1 + cot |-||      |1 + tan |- + --||   
      \        \2//      \        \2   4 //   
$$\frac{5 \left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} - 1\right)^{2}}{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}} + \frac{5 \left(\cot^{2}{\left(\frac{a}{2} \right)} - 1\right)^{2}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} + 3$$
                        2                  2
      /       2/a   pi\\      /       2/a\\ 
    5*|1 - cot |- + --||    5*|1 - tan |-|| 
      \        \2   4 //      \        \2// 
3 + --------------------- + ----------------
                       2                  2 
     /       2/a   pi\\      /       2/a\\  
     |1 + cot |- + --||      |1 + tan |-||  
     \        \2   4 //      \        \2//  
$$\frac{5 \left(- \tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} + \frac{5 \left(- \cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}}{\left(\cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}} + 3$$
      //   0     for a mod pi = 0\     //     1        for a mod 2*pi = 0\
      ||                         |     ||                                |
3 + 5*|<   2                     | + 5*|<   2/    pi\                    |
      ||sin (a)     otherwise    |     ||sin |a + --|      otherwise     |
      \\                         /     \\    \    2 /                    /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\sin^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\sin^{2}{\left(a + \frac{\pi}{2} \right)} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //     0        for a mod pi = 0\     //   1     for a mod 2*pi = 0\
      ||                              |     ||                           |
3 + 5*|<   2/    pi\                  | + 5*|<   2                       |
      ||cos |a - --|     otherwise    |     ||cos (a)      otherwise     |
      \\    \    2 /                  /     \\                           /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\cos^{2}{\left(a - \frac{\pi}{2} \right)} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\cos^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //     0        for a mod pi = 0\     //   1     for a mod 2*pi = 0\
      ||                              |     ||                           |
      ||     1                        |     ||   1                       |
3 + 5*|<------------     otherwise    | + 5*|<-------      otherwise     |
      ||   2/    pi\                  |     ||   2                       |
      ||sec |a - --|                  |     ||sec (a)                    |
      \\    \    2 /                  /     \\                           /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{1}{\sec^{2}{\left(a - \frac{\pi}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{1}{\sec^{2}{\left(a \right)}} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //   0     for a mod pi = 0\     //     1        for a mod 2*pi = 0\
      ||                         |     ||                                |
      ||   1                     |     ||     1                          |
3 + 5*|<-------     otherwise    | + 5*|<------------      otherwise     |
      ||   2                     |     ||   2/pi    \                    |
      ||csc (a)                  |     ||csc |-- - a|                    |
      \\                         /     \\    \2     /                    /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{1}{\csc^{2}{\left(a \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{1}{\csc^{2}{\left(- a + \frac{\pi}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                         //                             /    3*pi\             \
      //   1     for a mod 2*pi = 0\     ||           1             for |a + ----| mod 2*pi = 0|
      ||                           |     ||                             \     2  /             |
3 + 5*|<   2                       | + 5*|<                                                    |
      ||cos (a)      otherwise     |     ||       4/a\        2/a\                             |
      \\                           /     ||- 4*cos |-| + 4*cos |-|           otherwise         |
                                         \\        \2/         \2/                             /
$$\left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\cos^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: \left(a + \frac{3 \pi}{2}\right) \bmod 2 \pi = 0 \\- 4 \cos^{4}{\left(\frac{a}{2} \right)} + 4 \cos^{2}{\left(\frac{a}{2} \right)} & \text{otherwise} \end{cases}\right)\right) + 3$$
                     2                           
      /         4/a\\                            
      |    4*sin |-||                            
      |          \2/|                            
    5*|1 - ---------|                 4/a\       
      |        2    |           80*sin |-|       
      \     sin (a) /                  \2/       
3 + ------------------ + ------------------------
                    2                   2        
     /         4/a\\     /         4/a\\         
     |    4*sin |-||     |    4*sin |-||         
     |          \2/|     |          \2/|     2   
     |1 + ---------|     |1 + ---------| *sin (a)
     |        2    |     |        2    |         
     \     sin (a) /     \     sin (a) /         
$$\frac{5 \left(- \frac{4 \sin^{4}{\left(\frac{a}{2} \right)}}{\sin^{2}{\left(a \right)}} + 1\right)^{2}}{\left(\frac{4 \sin^{4}{\left(\frac{a}{2} \right)}}{\sin^{2}{\left(a \right)}} + 1\right)^{2}} + 3 + \frac{80 \sin^{4}{\left(\frac{a}{2} \right)}}{\left(\frac{4 \sin^{4}{\left(\frac{a}{2} \right)}}{\sin^{2}{\left(a \right)}} + 1\right)^{2} \sin^{2}{\left(a \right)}}$$
                                       //                                /    pi\           \
      //   0     for a mod pi = 0\     ||            0               for |a + --| mod pi = 0|
      ||                         |     ||                                \    2 /           |
3 + 5*|<   2                     | + 5*|<                                                   |
      ||sin (a)     otherwise    |     ||            2    2/a   pi\                         |
      \\                         /     ||(1 + sin(a)) *cot |- + --|         otherwise       |
                                       \\                  \2   4 /                         /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\sin^{2}{\left(a \right)} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 0 & \text{for}\: \left(a + \frac{\pi}{2}\right) \bmod \pi = 0 \\\left(\sin{\left(a \right)} + 1\right)^{2} \cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //            0               for a mod pi = 0\     //             1                for a mod 2*pi = 0\
      ||                                            |     ||                                                |
      ||/   0     for a mod pi = 0                  |     ||/   1     for a mod 2*pi = 0                    |
3 + 5*|<|                                           | + 5*|<|                                               |
      ||<   2                          otherwise    |     ||<   2                             otherwise     |
      |||sin (a)     otherwise                      |     |||cos (a)      otherwise                         |
      \\\                                           /     \\\                                               /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\sin^{2}{\left(a \right)} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\cos^{2}{\left(a \right)} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //      0         for a mod pi = 0\     //       1         for a mod 2*pi = 0\
      ||                                |     ||                                   |
      ||       2/a\                     |     ||              2                    |
      ||  4*cot |-|                     |     ||/        2/a\\                     |
      ||        \2/                     |     |||-1 + cot |-||                     |
3 + 5*|<--------------     otherwise    | + 5*|<\         \2//                     |
      ||             2                  |     ||---------------      otherwise     |
      ||/       2/a\\                   |     ||              2                    |
      |||1 + cot |-||                   |     || /       2/a\\                     |
      ||\        \2//                   |     || |1 + cot |-||                     |
      \\                                /     \\ \        \2//                     /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \cot^{2}{\left(\frac{a}{2} \right)}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(\cot^{2}{\left(\frac{a}{2} \right)} - 1\right)^{2}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //      0         for a mod pi = 0\     //      1         for a mod 2*pi = 0\
      ||                                |     ||                                  |
      ||       2/a\                     |     ||             2                    |
      ||  4*tan |-|                     |     ||/       2/a\\                     |
      ||        \2/                     |     |||1 - tan |-||                     |
3 + 5*|<--------------     otherwise    | + 5*|<\        \2//                     |
      ||             2                  |     ||--------------      otherwise     |
      ||/       2/a\\                   |     ||             2                    |
      |||1 + tan |-||                   |     ||/       2/a\\                     |
      ||\        \2//                   |     |||1 + tan |-||                     |
      \\                                /     \\\        \2//                     /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \tan^{2}{\left(\frac{a}{2} \right)}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(- \tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}}{\left(\tan^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                        2                              
      /       2/a   pi\\                               
      |    cos |- - --||                               
      |        \2   2 /|                               
    5*|1 - ------------|                               
      |         2/a\   |                2/a   pi\      
      |      cos |-|   |          20*cos |- - --|      
      \          \2/   /                 \2   2 /      
3 + --------------------- + ---------------------------
                       2                      2        
     /       2/a   pi\\     /       2/a   pi\\         
     |    cos |- - --||     |    cos |- - --||         
     |        \2   2 /|     |        \2   2 /|     2/a\
     |1 + ------------|     |1 + ------------| *cos |-|
     |         2/a\   |     |         2/a\   |      \2/
     |      cos |-|   |     |      cos |-|   |         
     \          \2/   /     \          \2/   /         
$$\frac{5 \left(1 - \frac{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} \right)}}\right)^{2}} + 3 + \frac{20 \cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\left(1 + \frac{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} \right)}}\right)^{2} \cos^{2}{\left(\frac{a}{2} \right)}}$$
                        2                                   
      /         2/a\   \                                    
      |      sec |-|   |                                    
      |          \2/   |                                    
    5*|1 - ------------|                                    
      |       2/a   pi\|                     2/a\           
      |    sec |- - --||               20*sec |-|           
      \        \2   2 //                      \2/           
3 + --------------------- + --------------------------------
                       2                      2             
     /         2/a\   \     /         2/a\   \              
     |      sec |-|   |     |      sec |-|   |              
     |          \2/   |     |          \2/   |     2/a   pi\
     |1 + ------------|     |1 + ------------| *sec |- - --|
     |       2/a   pi\|     |       2/a   pi\|      \2   2 /
     |    sec |- - --||     |    sec |- - --||              
     \        \2   2 //     \        \2   2 //              
$$\frac{5 \left(- \frac{\sec^{2}{\left(\frac{a}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} + 1\right)^{2}}{\left(\frac{\sec^{2}{\left(\frac{a}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} + 1\right)^{2}} + 3 + \frac{20 \sec^{2}{\left(\frac{a}{2} \right)}}{\left(\frac{\sec^{2}{\left(\frac{a}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} + 1\right)^{2} \sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}$$
                        2                              
      /       2/pi   a\\                               
      |    csc |-- - -||                               
      |        \2    2/|                               
    5*|1 - ------------|                               
      |         2/a\   |                2/pi   a\      
      |      csc |-|   |          20*csc |-- - -|      
      \          \2/   /                 \2    2/      
3 + --------------------- + ---------------------------
                       2                      2        
     /       2/pi   a\\     /       2/pi   a\\         
     |    csc |-- - -||     |    csc |-- - -||         
     |        \2    2/|     |        \2    2/|     2/a\
     |1 + ------------|     |1 + ------------| *csc |-|
     |         2/a\   |     |         2/a\   |      \2/
     |      csc |-|   |     |      csc |-|   |         
     \          \2/   /     \          \2/   /         
$$\frac{5 \left(1 - \frac{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}}{\csc^{2}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}}{\csc^{2}{\left(\frac{a}{2} \right)}}\right)^{2}} + 3 + \frac{20 \csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}}{\left(1 + \frac{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}}{\csc^{2}{\left(\frac{a}{2} \right)}}\right)^{2} \csc^{2}{\left(\frac{a}{2} \right)}}$$
                                                      //       1         for a mod 2*pi = 0\
                                                      ||                                   |
      //          0             for a mod pi = 0\     ||              2                    |
      ||                                        |     ||/        1   \                     |
      ||          4                             |     |||-1 + -------|                     |
      ||----------------------     otherwise    |     |||        2/a\|                     |
      ||             2                          |     |||     tan |-||                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4}{\left(1 + \frac{1}{\tan^{2}{\left(\frac{a}{2} \right)}}\right)^{2} \tan^{2}{\left(\frac{a}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(-1 + \frac{1}{\tan^{2}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{1}{\tan^{2}{\left(\frac{a}{2} \right)}}\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                              //                         /    pi\           \
      //      0         for a mod pi = 0\     ||         0           for |a + --| mod pi = 0|
      ||                                |     ||                         \    2 /           |
      ||       2/a\                     |     ||                                            |
      ||  4*cot |-|                     |     ||        2/a   pi\                           |
      ||        \2/                     |     ||   4*cot |- + --|                           |
3 + 5*|<--------------     otherwise    | + 5*|<         \2   4 /                           |
      ||             2                  |     ||-------------------         otherwise       |
      ||/       2/a\\                   |     ||                  2                         |
      |||1 + cot |-||                   |     ||/       2/a   pi\\                          |
      ||\        \2//                   |     |||1 + cot |- + --||                          |
      \\                                /     ||\        \2   4 //                          |
                                              \\                                            /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \cot^{2}{\left(\frac{a}{2} \right)}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 0 & \text{for}\: \left(a + \frac{\pi}{2}\right) \bmod \pi = 0 \\\frac{4 \cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)}}{\left(\cot^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                                 //                          /    3*pi\             \
      //       1         for a mod 2*pi = 0\     ||         1            for |a + ----| mod 2*pi = 0|
      ||                                   |     ||                          \     2  /             |
      ||              2                    |     ||                                                 |
      ||/        2/a\\                     |     ||                   2                             |
      |||-1 + cot |-||                     |     ||/        2/a   pi\\                              |
3 + 5*|<\         \2//                     | + 5*|<|-1 + tan |- + --||                              |
      ||---------------      otherwise     |     ||\         \2   4 //                              |
      ||              2                    |     ||--------------------           otherwise         |
      || /       2/a\\                     |     ||                  2                              |
      || |1 + cot |-||                     |     ||/       2/a   pi\\                               |
      \\ \        \2//                     /     |||1 + tan |- + --||                               |
                                                 \\\        \2   4 //                               /
$$\left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(\cot^{2}{\left(\frac{a}{2} \right)} - 1\right)^{2}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: \left(a + \frac{3 \pi}{2}\right) \bmod 2 \pi = 0 \\\frac{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} - 1\right)^{2}}{\left(\tan^{2}{\left(\frac{a}{2} + \frac{\pi}{4} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //           0              for a mod pi = 0\                                                  
      ||                                          |     //          1             for a mod 2*pi = 0\
      ||           2                              |     ||                                          |
      ||        sin (a)                           |     ||                     2                    |
      ||------------------------     otherwise    |     ||/   2           4/a\\                     |
      ||               2                          |     |||sin (a) - 4*sin |-||                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{\sin^{2}{\left(a \right)}}{\left(1 + \frac{\sin^{2}{\left(a \right)}}{4 \sin^{4}{\left(\frac{a}{2} \right)}}\right)^{2} \sin^{4}{\left(\frac{a}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(- 4 \sin^{4}{\left(\frac{a}{2} \right)} + \sin^{2}{\left(a \right)}\right)^{2}}{\left(4 \sin^{4}{\left(\frac{a}{2} \right)} + \sin^{2}{\left(a \right)}\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                                        //        1          for a mod 2*pi = 0\
                                                        ||                                     |
      //           0              for a mod pi = 0\     ||                2                    |
      ||                                          |     ||/         2    \                     |
      ||           2                              |     |||      sin (a) |                     |
      ||        sin (a)                           |     |||-1 + ---------|                     |
      ||------------------------     otherwise    |     |||          4/a\|                     |
      ||               2                          |     |||     4*sin |-||                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{\sin^{2}{\left(a \right)}}{\left(1 + \frac{\sin^{2}{\left(a \right)}}{4 \sin^{4}{\left(\frac{a}{2} \right)}}\right)^{2} \sin^{4}{\left(\frac{a}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(-1 + \frac{\sin^{2}{\left(a \right)}}{4 \sin^{4}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{\sin^{2}{\left(a \right)}}{4 \sin^{4}{\left(\frac{a}{2} \right)}}\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
      //                0                  for a mod pi = 0\     //                 1                    for a mod 2*pi = 0\
      ||                                                   |     ||                                                        |
      ||/      0         for a mod pi = 0                  |     ||/       1         for a mod 2*pi = 0                    |
      |||                                                  |     |||                                                       |
      |||       2/a\                                       |     |||              2                                        |
      |||  4*cot |-|                                       |     |||/        2/a\\                                         |
3 + 5*|<|        \2/                                       | + 5*|<||-1 + cot |-||                                         |
      ||<--------------     otherwise         otherwise    |     ||<\         \2//                           otherwise     |
      |||             2                                    |     |||---------------      otherwise                         |
      |||/       2/a\\                                     |     |||              2                                        |
      ||||1 + cot |-||                                     |     ||| /       2/a\\                                         |
      |||\        \2//                                     |     ||| |1 + cot |-||                                         |
      \\\                                                  /     \\\ \        \2//                                         /
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \cot^{2}{\left(\frac{a}{2} \right)}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(\cot^{2}{\left(\frac{a}{2} \right)} - 1\right)^{2}}{\left(\cot^{2}{\left(\frac{a}{2} \right)} + 1\right)^{2}} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                                                //         1            for a mod 2*pi = 0\
                                                                ||                                        |
      //               0                  for a mod pi = 0\     ||                   2                    |
      ||                                                  |     ||/          2/a\   \                     |
      ||                2/a\                              |     |||       cos |-|   |                     |
      ||           4*cos |-|                              |     |||           \2/   |                     |
      ||                 \2/                              |     |||-1 + ------------|                     |
      ||--------------------------------     otherwise    |     |||        2/a   pi\|                     |
      ||                  2                               |     |||     cos |- - --||                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \cos^{2}{\left(\frac{a}{2} \right)}}{\left(\frac{\cos^{2}{\left(\frac{a}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} + 1\right)^{2} \cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(\frac{\cos^{2}{\left(\frac{a}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} - 1\right)^{2}}{\left(\frac{\cos^{2}{\left(\frac{a}{2} \right)}}{\cos^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                                           //         1            for a mod 2*pi = 0\
                                                           ||                                        |
      //             0               for a mod pi = 0\     ||                   2                    |
      ||                                             |     ||/        2/a   pi\\                     |
      ||            2/a   pi\                        |     |||     sec |- - --||                     |
      ||       4*sec |- - --|                        |     |||         \2   2 /|                     |
      ||             \2   2 /                        |     |||-1 + ------------|                     |
      ||---------------------------     otherwise    |     |||          2/a\   |                     |
      ||                  2                          |     |||       sec |-|   |                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\left(1 + \frac{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} \right)}}\right)^{2} \sec^{2}{\left(\frac{a}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(-1 + \frac{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} \right)}}\right)^{2}}{\left(1 + \frac{\sec^{2}{\left(\frac{a}{2} - \frac{\pi}{2} \right)}}{\sec^{2}{\left(\frac{a}{2} \right)}}\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
                                                                //         1            for a mod 2*pi = 0\
                                                                ||                                        |
      //               0                  for a mod pi = 0\     ||                   2                    |
      ||                                                  |     ||/          2/a\   \                     |
      ||                2/a\                              |     |||       csc |-|   |                     |
      ||           4*csc |-|                              |     |||           \2/   |                     |
      ||                 \2/                              |     |||-1 + ------------|                     |
      ||--------------------------------     otherwise    |     |||        2/pi   a\|                     |
      ||                  2                               |     |||     csc |-- - -||                     |
3 + 5*|
            
$$\left(5 \left(\begin{cases} 0 & \text{for}\: a \bmod \pi = 0 \\\frac{4 \csc^{2}{\left(\frac{a}{2} \right)}}{\left(\frac{\csc^{2}{\left(\frac{a}{2} \right)}}{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}} + 1\right)^{2} \csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}} & \text{otherwise} \end{cases}\right)\right) + \left(5 \left(\begin{cases} 1 & \text{for}\: a \bmod 2 \pi = 0 \\\frac{\left(\frac{\csc^{2}{\left(\frac{a}{2} \right)}}{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}} - 1\right)^{2}}{\left(\frac{\csc^{2}{\left(\frac{a}{2} \right)}}{\csc^{2}{\left(- \frac{a}{2} + \frac{\pi}{2} \right)}} + 1\right)^{2}} & \text{otherwise} \end{cases}\right)\right) + 3$$
3 + 5*Piecewise((0, Mod(a = pi, 0)), (4*csc(a/2)^2/((1 + csc(a/2)^2/csc(pi/2 - a/2)^2)^2*csc(pi/2 - a/2)^2), True)) + 5*Piecewise((1, Mod(a = 2*pi, 0)), ((-1 + csc(a/2)^2/csc(pi/2 - a/2)^2)^2/(1 + csc(a/2)^2/csc(pi/2 - a/2)^2)^2, True))
Численный ответ [src]
3.0 + 5.0*cos(a)^2 + 5.0*sin(a)^2
3.0 + 5.0*cos(a)^2 + 5.0*sin(a)^2
Степени [src]
                    2                     2
      / I*a    -I*a\      /   -I*a    I*a\ 
      |e      e    |    5*\- e     + e   / 
3 + 5*|---- + -----|  - -------------------
      \ 2       2  /             4         
$$5 \left(\frac{e^{i a}}{2} + \frac{e^{- i a}}{2}\right)^{2} - \frac{5 \left(e^{i a} - e^{- i a}\right)^{2}}{4} + 3$$
3 + 5*(exp(i*a)/2 + exp(-i*a)/2)^2 - 5*(-exp(-i*a) + exp(i*a))^2/4