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4^cos(x)=1/2

4^cos(x)=1/2 уравнение

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Численное решение:

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Решение

Вы ввели [src]
 cos(x)      
4       = 1/2
$$4^{\cos{\left(x \right)}} = \frac{1}{2}$$
График
Сумма и произведение корней [src]
сумма
2*pi   4*pi       /    /  1    pi*I \\              /    /  1    pi*I \\       /    /  1    pi*I \\     /    /  1    pi*I \\
---- + ---- + - re|acos|- - + ------|| + 2*pi - I*im|acos|- - + ------|| + I*im|acos|- - + ------|| + re|acos|- - + ------||
 3      3         \    \  2   log(2)//              \    \  2   log(2)//       \    \  2   log(2)//     \    \  2   log(2)//
$$\left(\frac{2 \pi}{3}\right) + \left(\frac{4 \pi}{3}\right) + \left(- \operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}\right) + \left(\operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}\right)$$
=
4*pi
$$4 \pi$$
произведение
2*pi   4*pi       /    /  1    pi*I \\              /    /  1    pi*I \\       /    /  1    pi*I \\     /    /  1    pi*I \\
---- * ---- * - re|acos|- - + ------|| + 2*pi - I*im|acos|- - + ------|| * I*im|acos|- - + ------|| + re|acos|- - + ------||
 3      3         \    \  2   log(2)//              \    \  2   log(2)//       \    \  2   log(2)//     \    \  2   log(2)//
$$\left(\frac{2 \pi}{3}\right) * \left(\frac{4 \pi}{3}\right) * \left(- \operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}\right) * \left(\operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}\right)$$
=
     2 /    /    /-(-2*pi*I + log(2)) \\     /    /-(-2*pi*I + log(2)) \\\ /            /    /-(-2*pi*I + log(2)) \\     /    /-(-2*pi*I + log(2)) \\\
-8*pi *|I*im|acos|--------------------|| + re|acos|--------------------|||*|-2*pi + I*im|acos|--------------------|| + re|acos|--------------------|||
       \    \    \      2*log(2)      //     \    \      2*log(2)      /// \            \    \      2*log(2)      //     \    \      2*log(2)      ///
------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                          9                                                                           
$$- \frac{8 \pi^{2} \left(\operatorname{re}{\left(\operatorname{acos}{\left(- \frac{\log{\left(2 \right)} - 2 i \pi}{2 \log{\left(2 \right)}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{\log{\left(2 \right)} - 2 i \pi}{2 \log{\left(2 \right)}} \right)}\right)}\right) \left(- 2 \pi + \operatorname{re}{\left(\operatorname{acos}{\left(- \frac{\log{\left(2 \right)} - 2 i \pi}{2 \log{\left(2 \right)}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{\log{\left(2 \right)} - 2 i \pi}{2 \log{\left(2 \right)}} \right)}\right)}\right)}{9}$$
Быстрый ответ [src]
      2*pi
x_1 = ----
       3  
$$x_{1} = \frac{2 \pi}{3}$$
      4*pi
x_2 = ----
       3  
$$x_{2} = \frac{4 \pi}{3}$$
          /    /  1    pi*I \\              /    /  1    pi*I \\
x_3 = - re|acos|- - + ------|| + 2*pi - I*im|acos|- - + ------||
          \    \  2   log(2)//              \    \  2   log(2)//
$$x_{3} = - \operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}$$
          /    /  1    pi*I \\     /    /  1    pi*I \\
x_4 = I*im|acos|- - + ------|| + re|acos|- - + ------||
          \    \  2   log(2)//     \    \  2   log(2)//
$$x_{4} = \operatorname{re}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(- \frac{1}{2} + \frac{i \pi}{\log{\left(2 \right)}} \right)}\right)}$$
Численный ответ [src]
x1 = -48.1710873550435
x2 = -79.5870138909414
x3 = -46.0766922526503
x4 = -10.471975511966
x5 = 41.8879020478639
x6 = 54.4542726622231
x7 = 2.0943951023932
x8 = -60.7374579694027
x9 = -8.37758040957278
x10 = 73.3038285837618
x11 = -98.4365698124802
x12 = -35.6047167406843
x13 = 52.3598775598299
x14 = 23.0383461263252
x15 = 39.7935069454707
x16 = -2.0943951023932
x17 = 79.5870138909414
x18 = 60.7374579694027
x19 = 20.943951023932
x20 = -33.5103216382911
x21 = 8.37758040957278
x22 = 96.342174710087
x23 = 83.7758040957278
x24 = 4.18879020478639
x25 = 48.1710873550435
x26 = 825.191670342919
x27 = 77.4926187885482
x28 = -90.0589894029074
x29 = -4.18879020478639
x30 = -67.0206432765823
x31 = 33.5103216382911
x32 = -77.4926187885482
x33 = -54.4542726622231
x34 = -14.6607657167524
x35 = 90.0589894029074
x36 = -41.8879020478639
x37 = 35.6047167406843
x38 = -39.7935069454707
x39 = 14.6607657167524
x40 = 92.1533845053006
x41 = 46.0766922526503
x42 = -71.2094334813686
x43 = 64.9262481741891
x44 = 10.471975511966
x45 = -58.6430628670095
x46 = -16.7551608191456
x47 = -20.943951023932
x48 = 85.870199198121
x49 = 67.0206432765823
x50 = 71.2094334813686
x51 = -29.3215314335047
x52 = 16.7551608191456
x53 = -85.870199198121
x54 = 322.536845768552
x55 = -23.0383461263252
x56 = 121.474915938805
x57 = 98.4365698124802
x58 = -52.3598775598299
x59 = -96.342174710087
x60 = -83.7758040957278
x61 = -73.3038285837618
x62 = 58.6430628670095
x63 = 27.2271363311115
x64 = 29.3215314335047
x65 = -64.9262481741891
x66 = -27.2271363311115
x67 = -92.1533845053006
x67 = -92.1533845053006
График
4^cos(x)=1/2 уравнение