Prove the identity cot(A2)+tan(A2)=2csc(A)\cot(\frac{A}{2}) + \tan(\frac{A}{2}) = 2\csc(A)cot(2A)+tan(2A)=2csc(A).
False; this identity does not hold
True; this is a valid identity
True; but only when A≠0,π,2π,...A \neq 0, \pi, 2\pi, ...A=0,π,2π,...
True; but only for acute angles AAA