Images COS 4 X

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Cos 4 x. Sin^2 x +4 cos x -4 =0. Cos4x+cos2x 0. Cos4x-cosx 0. Cos4x-sin4x=0.
Sin^2 x +4 cos x -4 =0. Cos4x+cos2x 0. Cos4x-cosx 0. Cos4x-sin4x=0.

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