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5*cos(x) если x=-4

Выражение, которое надо упростить:

Решение

Вы ввели [src]
5*cos(x)
$$5 \cos{\left(x \right)}$$
5*cos(x)
Подстановка условия [src]
5*cos(x) при x = -4
подставляем
5*cos(x)
$$5 \cos{\left(x \right)}$$
5*cos(x)
$$5 \cos{\left(x \right)}$$
переменные
x = -4
$$x = -4$$
5*cos((-4))
$$5 \cos{\left((-4) \right)}$$
5*cos(-4)
$$5 \cos{\left(-4 \right)}$$
5*cos(4)
$$5 \cos{\left(4 \right)}$$
5*cos(4)
Численный ответ [src]
5.0*cos(x)
5.0*cos(x)
Степени [src]
   I*x      -I*x
5*e      5*e    
------ + -------
  2         2   
$$\frac{5 e^{i x}}{2} + \frac{5 e^{- i x}}{2}$$
5*exp(i*x)/2 + 5*exp(-i*x)/2
Тригонометрическая часть [src]
  5   
------
sec(x)
$$\frac{5}{\sec{\left(x \right)}}$$
     /    pi\
5*sin|x + --|
     \    2 /
$$5 \sin{\left(x + \frac{\pi}{2} \right)}$$
     5     
-----------
   /pi    \
csc|-- - x|
   \2     /
$$\frac{5}{\csc{\left(- x + \frac{\pi}{2} \right)}}$$
  /        2/x\\
5*|-1 + cot |-||
  \         \2//
----------------
         2/x\   
  1 + cot |-|   
          \2/   
$$\frac{5 \left(\cot^{2}{\left(\frac{x}{2} \right)} - 1\right)}{\cot^{2}{\left(\frac{x}{2} \right)} + 1}$$
  /       2/x\\
5*|1 - tan |-||
  \        \2//
---------------
         2/x\  
  1 + tan |-|  
          \2/  
$$\frac{5 \cdot \left(- \tan^{2}{\left(\frac{x}{2} \right)} + 1\right)}{\tan^{2}{\left(\frac{x}{2} \right)} + 1}$$
       /x   pi\ 
 10*tan|- + --| 
       \2   4 / 
----------------
       2/x   pi\
1 + tan |- + --|
        \2   4 /
$$\frac{10 \tan{\left(\frac{x}{2} + \frac{\pi}{4} \right)}}{\tan^{2}{\left(\frac{x}{2} + \frac{\pi}{4} \right)} + 1}$$
  //  1     for x mod 2*pi = 0\
5*|<                          |
  \\cos(x)      otherwise     /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\cos{\left(x \right)} & \text{otherwise} \end{cases}\right)$$
  /       1   \
5*|1 - -------|
  |       2/x\|
  |    cot |-||
  \        \2//
---------------
         1     
  1 + -------  
         2/x\  
      cot |-|  
          \2/  
$$\frac{5 \cdot \left(1 - \frac{1}{\cot^{2}{\left(\frac{x}{2} \right)}}\right)}{1 + \frac{1}{\cot^{2}{\left(\frac{x}{2} \right)}}}$$
  //  1     for x mod 2*pi = 0\
  ||                          |
5*|<  1                       |
  ||------      otherwise     |
  \\sec(x)                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{1}{\sec{\left(x \right)}} & \text{otherwise} \end{cases}\right)$$
  //     1       for x mod 2*pi = 0\
  ||                               |
5*|<   /    pi\                    |
  ||sin|x + --|      otherwise     |
  \\   \    2 /                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\sin{\left(x + \frac{\pi}{2} \right)} & \text{otherwise} \end{cases}\right)$$
  //     1       for x mod 2*pi = 0\
  ||                               |
  ||     1                         |
5*|<-----------      otherwise     |
  ||   /pi    \                    |
  ||csc|-- - x|                    |
  \\   \2     /                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{1}{\csc{\left(- x + \frac{\pi}{2} \right)}} & \text{otherwise} \end{cases}\right)$$
10*(-1 - cos(2*x) + 2*cos(x)) 
------------------------------
                             2
1 - cos(2*x) + 2*(1 - cos(x)) 
$$\frac{10 \cdot \left(2 \cos{\left(x \right)} - \cos{\left(2 x \right)} - 1\right)}{2 \left(- \cos{\left(x \right)} + 1\right)^{2} - \cos{\left(2 x \right)} + 1}$$
  /         4/x\\
  |    4*sin |-||
  |          \2/|
5*|1 - ---------|
  |        2    |
  \     sin (x) /
-----------------
           4/x\  
      4*sin |-|  
            \2/  
  1 + ---------  
          2      
       sin (x)   
$$\frac{5 \left(- \frac{4 \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + 1\right)}{\frac{4 \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + 1}$$
  //     1        for x mod 2*pi = 0\
  ||                                |
  ||        2/x\                    |
  ||-1 + cot |-|                    |
5*|<         \2/                    |
  ||------------      otherwise     |
  ||       2/x\                     |
  ||1 + cot |-|                     |
  \\        \2/                     /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{\cot^{2}{\left(\frac{x}{2} \right)} - 1}{\cot^{2}{\left(\frac{x}{2} \right)} + 1} & \text{otherwise} \end{cases}\right)$$
  //     1       for x mod 2*pi = 0\
  ||                               |
  ||       2/x\                    |
  ||1 - tan |-|                    |
5*|<        \2/                    |
  ||-----------      otherwise     |
  ||       2/x\                    |
  ||1 + tan |-|                    |
  \\        \2/                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{- \tan^{2}{\left(\frac{x}{2} \right)} + 1}{\tan^{2}{\left(\frac{x}{2} \right)} + 1} & \text{otherwise} \end{cases}\right)$$
  //             1               for x mod 2*pi = 0\
  ||                                               |
5*|
            
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\cos{\left(x \right)} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)$$
  //     1        for x mod 2*pi = 0\
  ||                                |
  ||        1                       |
  ||-1 + -------                    |
  ||        2/x\                    |
  ||     tan |-|                    |
5*|<         \2/                    |
  ||------------      otherwise     |
  ||       1                        |
  ||1 + -------                     |
  ||       2/x\                     |
  ||    tan |-|                     |
  \\        \2/                     /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{-1 + \frac{1}{\tan^{2}{\left(\frac{x}{2} \right)}}}{1 + \frac{1}{\tan^{2}{\left(\frac{x}{2} \right)}}} & \text{otherwise} \end{cases}\right)$$
  //                              /    pi\           \
  ||           0              for |x + --| mod pi = 0|
  ||                              \    2 /           |
5*|<                                                 |
  ||                /x   pi\                         |
  ||(1 + sin(x))*cot|- + --|         otherwise       |
  \\                \2   4 /                         /
$$5 \left(\begin{cases} 0 & \text{for}\: \left(x + \frac{\pi}{2}\right) \bmod \pi = 0 \\\left(\sin{\left(x \right)} + 1\right) \cot{\left(\frac{x}{2} + \frac{\pi}{4} \right)} & \text{otherwise} \end{cases}\right)$$
  /         2/x\   \
  |      sec |-|   |
  |          \2/   |
5*|1 - ------------|
  |       2/x   pi\|
  |    sec |- - --||
  \        \2   2 //
--------------------
           2/x\     
        sec |-|     
            \2/     
  1 + ------------  
         2/x   pi\  
      sec |- - --|  
          \2   2 /  
$$\frac{5 \left(- \frac{\sec^{2}{\left(\frac{x}{2} \right)}}{\sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + 1\right)}{\frac{\sec^{2}{\left(\frac{x}{2} \right)}}{\sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + 1}$$
  /       2/x   pi\\
  |    cos |- - --||
  |        \2   2 /|
5*|1 - ------------|
  |         2/x\   |
  |      cos |-|   |
  \          \2/   /
--------------------
         2/x   pi\  
      cos |- - --|  
          \2   2 /  
  1 + ------------  
           2/x\     
        cos |-|     
            \2/     
$$\frac{5 \cdot \left(1 - \frac{\cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\cos^{2}{\left(\frac{x}{2} \right)}}\right)}{1 + \frac{\cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\cos^{2}{\left(\frac{x}{2} \right)}}}$$
  /       2/pi   x\\
  |    csc |-- - -||
  |        \2    2/|
5*|1 - ------------|
  |         2/x\   |
  |      csc |-|   |
  \          \2/   /
--------------------
         2/pi   x\  
      csc |-- - -|  
          \2    2/  
  1 + ------------  
           2/x\     
        csc |-|     
            \2/     
$$\frac{5 \cdot \left(1 - \frac{\csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}}{\csc^{2}{\left(\frac{x}{2} \right)}}\right)}{1 + \frac{\csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}}{\csc^{2}{\left(\frac{x}{2} \right)}}}$$
  //                      /    pi\           \
  ||       0          for |x + --| mod pi = 0|
  ||                      \    2 /           |
  ||                                         |
  ||      /x   pi\                           |
5*|< 2*cot|- + --|                           |
  ||      \2   4 /                           |
  ||----------------         otherwise       |
  ||       2/x   pi\                         |
  ||1 + cot |- + --|                         |
  \\        \2   4 /                         /
$$5 \left(\begin{cases} 0 & \text{for}\: \left(x + \frac{\pi}{2}\right) \bmod \pi = 0 \\\frac{2 \cot{\left(\frac{x}{2} + \frac{\pi}{4} \right)}}{\cot^{2}{\left(\frac{x}{2} + \frac{\pi}{4} \right)} + 1} & \text{otherwise} \end{cases}\right)$$
  //             1               for x mod 2*pi = 0\
  ||                                               |
  ||           2                                   |
5*|< -4 + 4*sin (x) + 4*cos(x)                     |
  ||---------------------------      otherwise     |
  ||              2        2                       |
  \\2*(1 - cos(x))  + 2*sin (x)                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{4 \sin^{2}{\left(x \right)} + 4 \cos{\left(x \right)} - 4}{2 \left(- \cos{\left(x \right)} + 1\right)^{2} + 2 \sin^{2}{\left(x \right)}} & \text{otherwise} \end{cases}\right)$$
  //      1         for x mod 2*pi = 0\
  ||                                  |
  ||         2                        |
  ||      sin (x)                     |
  ||-1 + ---------                    |
  ||          4/x\                    |
  ||     4*sin |-|                    |
5*|<           \2/                    |
  ||--------------      otherwise     |
  ||        2                         |
  ||     sin (x)                      |
  ||1 + ---------                     |
  ||         4/x\                     |
  ||    4*sin |-|                     |
  \\          \2/                     /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{-1 + \frac{\sin^{2}{\left(x \right)}}{4 \sin^{4}{\left(\frac{x}{2} \right)}}}{1 + \frac{\sin^{2}{\left(x \right)}}{4 \sin^{4}{\left(\frac{x}{2} \right)}}} & \text{otherwise} \end{cases}\right)$$
  //                1                  for x mod 2*pi = 0\
  ||                                                     |
  ||/     1        for x mod 2*pi = 0                    |
  |||                                                    |
  |||        2/x\                                        |
5*|<|-1 + cot |-|                                        |
  ||<         \2/                          otherwise     |
  |||------------      otherwise                         |
  |||       2/x\                                         |
  |||1 + cot |-|                                         |
  \\\        \2/                                         /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{\cot^{2}{\left(\frac{x}{2} \right)} - 1}{\cot^{2}{\left(\frac{x}{2} \right)} + 1} & \text{otherwise} \end{cases} & \text{otherwise} \end{cases}\right)$$
  //        1          for x mod 2*pi = 0\
  ||                                     |
  ||          2/x\                       |
  ||       cos |-|                       |
  ||           \2/                       |
  ||-1 + ------------                    |
  ||        2/x   pi\                    |
  ||     cos |- - --|                    |
5*|<         \2   2 /                    |
  ||-----------------      otherwise     |
  ||          2/x\                       |
  ||       cos |-|                       |
  ||           \2/                       |
  || 1 + ------------                    |
  ||        2/x   pi\                    |
  ||     cos |- - --|                    |
  \\         \2   2 /                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{\frac{\cos^{2}{\left(\frac{x}{2} \right)}}{\cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} - 1}{\frac{\cos^{2}{\left(\frac{x}{2} \right)}}{\cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + 1} & \text{otherwise} \end{cases}\right)$$
  //        1          for x mod 2*pi = 0\
  ||                                     |
  ||        2/x   pi\                    |
  ||     sec |- - --|                    |
  ||         \2   2 /                    |
  ||-1 + ------------                    |
  ||          2/x\                       |
  ||       sec |-|                       |
5*|<           \2/                       |
  ||-----------------      otherwise     |
  ||        2/x   pi\                    |
  ||     sec |- - --|                    |
  ||         \2   2 /                    |
  || 1 + ------------                    |
  ||          2/x\                       |
  ||       sec |-|                       |
  \\           \2/                       /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{-1 + \frac{\sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\sec^{2}{\left(\frac{x}{2} \right)}}}{1 + \frac{\sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\sec^{2}{\left(\frac{x}{2} \right)}}} & \text{otherwise} \end{cases}\right)$$
  //        1          for x mod 2*pi = 0\
  ||                                     |
  ||          2/x\                       |
  ||       csc |-|                       |
  ||           \2/                       |
  ||-1 + ------------                    |
  ||        2/pi   x\                    |
  ||     csc |-- - -|                    |
5*|<         \2    2/                    |
  ||-----------------      otherwise     |
  ||          2/x\                       |
  ||       csc |-|                       |
  ||           \2/                       |
  || 1 + ------------                    |
  ||        2/pi   x\                    |
  ||     csc |-- - -|                    |
  \\         \2    2/                    /
$$5 \left(\begin{cases} 1 & \text{for}\: x \bmod 2 \pi = 0 \\\frac{\frac{\csc^{2}{\left(\frac{x}{2} \right)}}{\csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}} - 1}{\frac{\csc^{2}{\left(\frac{x}{2} \right)}}{\csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}} + 1} & \text{otherwise} \end{cases}\right)$$
5*Piecewise((1, Mod(x = 2*pi, 0)), ((-1 + csc(x/2)^2/csc(pi/2 - x/2)^2)/(1 + csc(x/2)^2/csc(pi/2 - x/2)^2), True))