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cos^2x+3cosx=0

cos^2x+3cosx=0 уравнение

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Численное решение:

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Решение

Вы ввели [src]
   2                  
cos (x) + 3*cos(x) = 0
$$\cos^{2}{\left(x \right)} + 3 \cos{\left(x \right)} = 0$$
График
Быстрый ответ [src]
      pi
x_1 = --
      2 
$$x_{1} = \frac{\pi}{2}$$
      3*pi
x_2 = ----
       2  
$$x_{2} = \frac{3 \pi}{2}$$
x_3 = -re(acos(-3)) + 2*pi - I*im(acos(-3))
$$x_{3} = - \operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}$$
x_4 = I*im(acos(-3)) + re(acos(-3))
$$x_{4} = \operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}$$
Сумма и произведение корней [src]
сумма
pi   3*pi                                                                        
-- + ---- + -re(acos(-3)) + 2*pi - I*im(acos(-3)) + I*im(acos(-3)) + re(acos(-3))
2     2                                                                          
$$\left(\frac{\pi}{2}\right) + \left(\frac{3 \pi}{2}\right) + \left(- \operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right) + \left(\operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right)$$
=
4*pi
$$4 \pi$$
произведение
pi   3*pi                                                                        
-- * ---- * -re(acos(-3)) + 2*pi - I*im(acos(-3)) * I*im(acos(-3)) + re(acos(-3))
2     2                                                                          
$$\left(\frac{\pi}{2}\right) * \left(\frac{3 \pi}{2}\right) * \left(- \operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + 2 \pi - i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right) * \left(\operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right)$$
=
     2                                                                        
-3*pi *(I*im(acos(-3)) + re(acos(-3)))*(-2*pi + I*im(acos(-3)) + re(acos(-3)))
------------------------------------------------------------------------------
                                      4                                       
$$- \frac{3 \pi^{2} \left(\operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right) \left(- 2 \pi + \operatorname{re}{\left(\operatorname{acos}{\left(-3 \right)}\right)} + i \operatorname{im}{\left(\operatorname{acos}{\left(-3 \right)}\right)}\right)}{4}$$
Численный ответ [src]
x1 = 61.261056745001
x2 = -48.6946861306418
x3 = 73.8274273593601
x4 = -70.6858347057703
x5 = 20.4203522483337
x6 = -20.4203522483337
x7 = 45.553093477052
x8 = 64.4026493985908
x9 = -80.1106126665397
x10 = -10.9955742875643
x11 = -54.9778714378214
x12 = -23.5619449019235
x13 = -7.85398163397448
x14 = -36.1283155162826
x15 = -76.9690200129499
x16 = 76.9690200129499
x17 = 54.9778714378214
x18 = 26.7035375555132
x19 = 23.5619449019235
x20 = 58.1194640914112
x21 = 14.1371669411541
x22 = -39.2699081698724
x23 = -83.2522053201295
x24 = 83.2522053201295
x25 = -64.4026493985908
x26 = -29.845130209103
x27 = 48.6946861306418
x28 = -1.5707963267949
x29 = 4.71238898038469
x30 = -45.553093477052
x31 = -14.1371669411541
x32 = 70.6858347057703
x33 = 86.3937979737193
x34 = 1.5707963267949
x35 = 95.8185759344887
x36 = -4.71238898038469
x37 = 7.85398163397448
x38 = 92.6769832808989
x39 = -256.039801267568
x40 = -67.5442420521806
x41 = 98.9601685880785
x42 = -42.4115008234622
x43 = 89.5353906273091
x44 = 51.8362787842316
x45 = -51.8362787842316
x46 = -58.1194640914112
x47 = 17.2787595947439
x48 = 10224.313291108
x49 = -95.8185759344887
x50 = 32.9867228626928
x51 = -61.261056745001
x52 = -98.9601685880785
x53 = 39.2699081698724
x54 = 10.9955742875643
x55 = -89.5353906273091
x56 = -92.6769832808989
x57 = -73.8274273593601
x58 = -17.2787595947439
x59 = 29.845130209103
x60 = 67.5442420521806
x61 = 80.1106126665397
x62 = -26.7035375555132
x63 = -32.9867228626928
x64 = 36.1283155162826
x65 = 42.4115008234622
x66 = -86.3937979737193
x66 = -86.3937979737193
График
cos^2x+3cosx=0 уравнение