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   ocr: double angle formulas half angle formulas sin 2x = 2 sin X COS . X sin X= + 1-cOSX 2 2 cos2x = cos?x - sin?x 1- 2sin?x COS X= + +COSX 2 2 - 2cos2x 1 I 2 tan X X = + 1-cOSX tan 2x - tan 2 t - COSX - tan?x table of contents