What is the derivative of f(x)=cot(x)f(x) = \cot(x)f(x)=cot(x)?
csc2(x)\csc^2(x)csc2(x)
−csc2(x)-\csc^2(x)−csc2(x)
sec2(x)\sec^2(x)sec2(x)
−sec2(x)-\sec^2(x)−sec2(x)