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2х п. Cos2x-sin(-x)=0. Cos2x+sin2x+1 0. Cos и sin 2x. Cosx−1+sin2x−−−−−−−−√=0.
Cos2x-sin(-x)=0. Cos2x+sin2x+1 0. Cos и sin 2x. Cosx−1+sin2x−−−−−−−−√=0.

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