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Sin2. Cos2x=2cos^2x-1. Sin2x+2cos2x=1. Синус 2x cos2x. Sin^2x*CОS^2x.
Cos2x=2cos^2x-1. Sin2x+2cos2x=1. Синус 2x cos2x. Sin^2x*CОS^2x.

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