Images 4 COS 4X

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4 cos 4x. 3cos4x<1. Cos4x 2cos 2x 0. 4cos4x-4cos2x+1. 4cos^2x-1=0.
3cos4x<1. Cos4x 2cos 2x 0. 4cos4x-4cos2x+1. 4cos^2x-1=0.

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