Images COS 4 X

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Cos 4 x. Sin^2 x +4 cos x -4 =0. 2sin^2x+cos4x=0. Sin2x/4-cos2x/4. Cos4x-sin2x 0.
Sin^2 x +4 cos x -4 =0. 2sin^2x+cos4x=0. Sin2x/4-cos2x/4. Cos4x-sin2x 0.

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