Question

помогите!!!
-cos²x+1=1-cos²x-cosx​

Answer 1

Ответ:

Объяснение:

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Answer 2

$-cos(x)^{2} +1=1-cos(x)^{2} -cos(x)$

$0=-cos(x)$

$-cos(x)=0$

$cos(x)=0$

$x=\frac{\pi }{2} +k\pi , k$∈$Z$