cos平方x等於什麼

cos⁡2x\cos^2xcos2x等於多種不同的表達式，以下是詳細介紹：

cos⁡2x=1−sin⁡2x\cos^2x = 1 - \sin^2xcos2x=1−sin2x

cos⁡2x=1+cos⁡2x2\cos^2x = \frac{1 + \cos2x}{2}cos2x=21+cos2x​

cos⁡2x=cos⁡2x+sin⁡2x\cos^2x = \cos2x + \sin^2xcos2x=cos2x+sin2x

cos⁡2x=sin⁡2xtan⁡2x\cos^2x = \frac{\sin^2x}{\tan^2x}cos2x=tan2xsin2x​