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sen2 x + cos2x 1
cos 2 x - sen 2 x
cos2x + sen2x 1 ring
sen 2x 2 sen x cos x
sen x + cos x 1
sen 2 x 1-cos 2x 2
sen 2 + cos 2 1
cos 2x+sen 2x 1
cos2x - sin2x
senx cos 90◦ − x
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