Solve them

What is f '(x) for f(x) = secxcscx? O sin 2 x - cos2 x sin2 xcos2 x O sin x + cos x sin x cos x O sin x cos x -1 sin xcos2 x O -sin2 x + cos2 x sin xcos xsin x Find f' for f(x) = COS X O COs X sin x O 1 sec* x O COS* X O tanx