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Sin3x. 2cos2x=sin (п/2+x). Cos x=cos 5x [-п/4; п/4]. Sin 2x-п/3 1. Sin(2x-п/6)=0.
2cos2x=sin (п/2+x). Cos x=cos 5x [-п/4; п/4]. Sin 2x-п/3 1. Sin(2x-п/6)=0.

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