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2cos2x. 2cos^2(x/2). Cos2x 1 cos2x 3sin2x. Sin 2 x/4 cos 2 x/4 sin π/2.
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2sin cos 2 x x π
2sinx 2 cos x
Cos x п 3п
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Неравенство sin x cos x
F x cos x 2x 3 4
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2cos2x. 2cos^2(x/2). Cos2x 1 cos2x 3sin2x. Sin 2 x/4 cos 2 x/4 sin π/2. 