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Cos 2 x. Cos π(x+2)/3 = 1/2 решение. 2cos2x. Cos^2 2x=2. Cos2x 1 cos2x 3sin2x.
Cos π(x+2)/3 = 1/2 решение. 2cos2x. Cos^2 2x=2. Cos2x 1 cos2x 3sin2x.

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