Решите пж cos3x-cos2x=0

cos3x-cos2x=0 cosx=0 x=[latex] \frac {\pi}{2} [/latex] + 2[latex] \pi k[/latex] x=-[latex] \frac{ \pi }{2} [/latex] + 2[latex] \pi n[/latex] [latex]n,k[/latex] ∈ [latex]Z[/latex]