(COS 4X +1) SIN 2X = COS² 2X

(COS 4X +1) SIN 2X = COS² 2X

Ответ:

(COS 4X +1) * SIN 2X = COS² 2X

2 * COS² 2X * SIN 2X = COS² 2X

COS² 2X * (2 * SIN 2X - 1) = 0

COS 2X = 0                                     SIN 2X = 1/2

2X = π/2 + π * n                             2X = (-1)^m * π / 6 + π * m

X = π/4 + π * n / 2                         X = (-1)^m * π / 12 + π * m / 2

Источник: https://znanija.com/task/299068