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5cos2(x)=2-9cosx

5cos2(x)=2-9cosx уравнение

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Численное решение:

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Решение

Вы ввели [src]
     2                  
5*cos (x) = 2 - 9*cos(x)
$$5 \cos^{2}{\left(x \right)} = - 9 \cos{\left(x \right)} + 2$$
График
Сумма и произведение корней [src]
сумма
-acos(1/5) + 2*pi + acos(1/5) + -re(acos(-2)) + 2*pi - I*im(acos(-2)) + I*im(acos(-2)) + re(acos(-2))
$$\left(- \operatorname{acos}{\left(\frac{1}{5} \right)} + 2 \pi\right) + \left(\operatorname{acos}{\left(\frac{1}{5} \right)}\right) + \left(- \operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right) + \left(\operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right)$$
=
4*pi
$$4 \pi$$
произведение
-acos(1/5) + 2*pi * acos(1/5) * -re(acos(-2)) + 2*pi - I*im(acos(-2)) * I*im(acos(-2)) + re(acos(-2))
$$\left(- \operatorname{acos}{\left(\frac{1}{5} \right)} + 2 \pi\right) * \left(\operatorname{acos}{\left(\frac{1}{5} \right)}\right) * \left(- \operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right) * \left(\operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right)$$
=
-(-acos(1/5) + 2*pi)*(I*im(acos(-2)) + re(acos(-2)))*(-2*pi + I*im(acos(-2)) + re(acos(-2)))*acos(1/5)
$$- \left(\operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right) \left(- \operatorname{acos}{\left(\frac{1}{5} \right)} + 2 \pi\right) \left(- 2 \pi + \operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}\right) \operatorname{acos}{\left(\frac{1}{5} \right)}$$
Быстрый ответ [src]
x_1 = -acos(1/5) + 2*pi
$$x_{1} = - \operatorname{acos}{\left(\frac{1}{5} \right)} + 2 \pi$$
x_2 = acos(1/5)
$$x_{2} = \operatorname{acos}{\left(\frac{1}{5} \right)}$$
x_3 = -re(acos(-2)) + 2*pi - I*im(acos(-2))
$$x_{3} = - \operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}$$
x_4 = I*im(acos(-2)) + re(acos(-2))
$$x_{4} = \operatorname{re}{\left(\operatorname{acos}{\left(-2 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-2 \right)}\right)}$$
Численный ответ [src]
x1 = -99.1615265088688
x2 = -36.329673437073
x3 = -11.1969322083546
x4 = -20.2189943275433
x5 = 89.3340327065188
x6 = -39.0685502490821
x7 = 20.2189943275433
x8 = -51.6349208634413
x9 = -74.0287852801505
x10 = 48.8960440514321
x11 = 51.6349208634413
x12 = -95.6172180136984
x13 = -80.3119705873301
x14 = 99.1615265088688
x15 = -32.7853649419025
x16 = -55.1792293586117
x17 = -86.5951558945096
x18 = 11.1969322083546
x19 = 80.3119705873301
x20 = 76.7676620921596
x21 = 1.36943840600457
x22 = 61.4624146657913
x23 = -89.3340327065188
x24 = 300.223456338616
x25 = 74.0287852801505
x26 = -76.7676620921596
x27 = -26.5021796347229
x28 = 23.7633028227138
x29 = -7.65262371318415
x30 = -13.9358090203637
x31 = 92.8783412016892
x32 = -92.8783412016892
x33 = 26.5021796347229
x34 = 67.7455999729709
x35 = -1.36943840600457
x36 = 45.3517355562617
x37 = -67.7455999729709
x38 = -4.91374690117502
x39 = 476.152644939644
x40 = 64.2012914778004
x41 = 32.7853649419025
x42 = 39.0685502490821
x43 = -143.143823659126
x44 = 83.0508473993392
x45 = -57.9181061706208
x46 = -30.0464881298934
x47 = 86.5951558945096
x48 = 95.6172180136984
x49 = 57.9181061706208
x50 = 7.65262371318415
x51 = -42.6128587442525
x52 = -64.2012914778004
x53 = 36.329673437073
x54 = -23.7633028227138
x55 = 42.6128587442525
x56 = -70.48447678498
x57 = 30.0464881298934
x58 = -83.0508473993392
x59 = -61.4624146657913
x60 = -17.4801175155342
x61 = 4.91374690117502
x62 = 70.48447678498
x63 = -45.3517355562617
x64 = 55.1792293586117
x65 = 13.9358090203637
x66 = -48.8960440514321
x67 = 70181.81044279
x68 = 17.4801175155342
x68 = 17.4801175155342
График
5cos2(x)=2-9cosx уравнение