Question

$cosx - \cos {}^{2} x =0$
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Answer 1

cosx(cosx-cos^2x)=0

cos x = 0

Или cos x = (cos x)^2

Тогда cos x = 0

Или

cos x = 1

cos x = 0

x= п/2+пн

cos x = 1

x = 2пн