Images 4 COS 4X

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4 cos 4x. 2cos4x-2cos 2x 3cos2x. Cosx cos2x cos3x. Cos4x-3cos2x 1. Cos^2x-cos2x=3/4.
2cos4x-2cos 2x 3cos2x. Cosx cos2x cos3x. Cos4x-3cos2x 1. Cos^2x-cos2x=3/4.

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