Consider f(x)=ln∣tan(x/2)∣f(x) = \ln |\tan(x/2)|f(x)=ln∣tan(x/2)∣. What is f′(x)f'(x)f′(x)?
cscx\csc xcscx
secx\sec xsecx
tanx\tan xtanx
cotx\cot xcotx