Practice problem
Simplify: 1−cos2xsec2x−1\dfrac {1-\cos^{2}x}{ \sec^{2}x -1}sec2x−11−cos2x
sin2x\sin^{2}xsin2x
cos2x\cos^{2}xcos2x
111
tan2x\tan^{2}xtan2x
Type a concept, like “slope” or “photosynthesis”.
