Images Y COS 2 4X

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Y cos 2 4x. 2+Cos4x 3 cos4x-sin4x. Cos2x. Sin4x-cos4x +2 cos2x. Sin2x/4-cos2x/4.
2+Cos4x 3 cos4x-sin4x. Cos2x. Sin4x-cos4x +2 cos2x. Sin2x/4-cos2x/4.