If cosA = (2cosB - 1)/ (2 - cosB)where (0 < A < pi, 0 < B < pi)

Question

then tan(A/2)cot(B/2) is equal to ? 

Answer 1

The value of function cosA = (2cosB - 1)/(2 - cosB) where (0 < A < pi, 0 < B < pi).