If y=ln(tan(x))y = \ln(\tan(x))y=ln(tan(x)), what is dydx\frac{dy}{dx}dxdy?
cot(x)sec2(x)\cot(x) \sec^2(x)cot(x)sec2(x)
sec2(x)/tan(x)\sec^2(x) / \tan(x)sec2(x)/tan(x)
1/tan(x)1 / \tan(x)1/tan(x)
csc(x)sec(x)\csc(x) \sec(x)csc(x)sec(x)