Images COS 4 X

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Cos 4 x. Cos2x=cos6x. 2cos2x cos4x-cos6x 0. Cos6x -cos3x+4=0. Cos4x cos2x 0 решение.
Cos2x=cos6x. 2cos2x cos4x-cos6x 0. Cos6x -cos3x+4=0. Cos4x cos2x 0 решение.

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