(cos x + 1)=cos^2 x + 1

Question

(cos x + 1)=cos^2 x + 1

Answer 1

Сos²x-cosx=0
cosx(cosx-1)=0
cosx=0⇒x=π/2+πn,n∈z
cosx=1⇒x=2πk,k∈z

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