Помогите !!!!!!!!!!!!!!!!!!!!!!

Question

Помогите !!!!!!!!!!!!!!!!!!!!!!

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Answer 1

1) sin3x=sinx
sin3x-sinx=0
2cos2xsinx=0
cos2x=0 или sinx=0
сos^2x-sin^2x=0 или x=pi*n, n ∈ Z
cos^2x=sin^2x
cosx=sinx
x=pi/4+2pi*k, k ∈ Z