(2cosx-1)*(cos2x+1)=0

(2cosx-1)*(cos2x+1)=0

Ответ:

1) cos x = 1/2                        2) cos 2*x = -1

x = ± π/3 + 2 * π * n                   2*x = π + 2 * π * n

                                                 x = π/2 + π * n

Источник: https://znanija.com/task/304655