Find the derivative of f(x)=ln(tanx)f(x) = \ln(\tan x)f(x)=ln(tanx).
sec2x/tanx\sec^2 x / \tan xsec2x/tanx
1sinxcosx\frac{1}{\sin x \cos x}sinxcosx1
2csc(2x)2\csc(2x)2csc(2x)
All of the above