Trigonometry
Write the following trigonometric expression in terms of sine and cosine. Express your answer in terms of xxx only.
csc2x−1cos2x−1\frac{\csc^2x-1}{\cos^2x-1}cos2x−1csc2x−1
−cos2xsin4x\frac{-\cos^2x}{\sin^4x}sin4x−cos2x
−cos2x-\cos^2x−cos2x
−cos2xsin2x\frac{-\cos^2x}{\sin^2x}sin2x−cos2x
cos2xsin4x\frac{\cos^2x}{\sin^4x}sin4xcos2x