Images Y COS 2 4X

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Y cos 2 4x. Y=cos2\4 - x\2. Y=2cos. 4sin^2x-cos2x=5. Cos x = 3/4.
Y=cos2\4 - x\2. Y=2cos. 4sin^2x-cos2x=5. Cos x = 3/4.

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