Images 4 COS 4X

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4 cos 4x. Cos4x cos2x 0 решение. Sin2x/4-cos2x/4. 2sin^2x+cos4x=0. Sin^2x=1/4.
Cos4x cos2x 0 решение. Sin2x/4-cos2x/4. 2sin^2x+cos4x=0. Sin^2x=1/4.

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