Sinx+sin3x=0 Помогите прошуу

Question

Sinx+sin3x=0


Помогите прошуу

Answer 1

Sinx + sin3x = 0
2sin2x * cosx = 0
sin2x = 0 = 2x = π * n = π * n : 2
cosx = 0 = x = +-π : 2 + πn