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cos2x + sen2x 1 ring
sen2x + cos2x 1
cos2x 1-2sinx
cos2x 1-2sin2x
sen x2 + cos x2 1
cos2x 1-sin2x
cosx-sinx cos2x
cos2x - sin2x
cos 2 x - sen 2 x
cos2x-sinx
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