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Sin3x. 4 Sin (x-7п/2) = 3/cosx. Sin2x/4-cos2x/4. Sin3x sin7x корень из 3 sin2x. 2sin^2x+cos4x=0.
4 Sin (x-7п/2) = 3/cosx. Sin2x/4-cos2x/4. Sin3x sin7x корень из 3 sin2x. 2sin^2x+cos4x=0.

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