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2х п. Cos3x 2sin 3п/2+x. Sin 7п/2 - x. Cos(3п/2-x)sin2x=sinx. Cos 3x-п/2 1/2.
Cos3x 2sin 3п/2+x. Sin 7п/2 - x. Cos(3п/2-x)sin2x=sinx. Cos 3x-п/2 1/2.

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