cos2x\cos^2xcos2x等於多種不同的表達式,以下是詳細介紹:
cos2x=1−sin2x\cos^2x = 1 - \sin^2xcos2x=1−sin2x
cos2x=1+cos2x2\cos^2x = \frac{1 + \cos2x}{2}cos2x=21+cos2x
cos2x=cos2x+sin2x\cos^2x = \cos2x + \sin^2xcos2x=cos2x+sin2x
cos2x=sin2xtan2x\cos^2x = \frac{\sin^2x}{\tan^2x}cos2x=tan2xsin2x