Question

If a,b,c are sides of a triangle and angles A,B,C are in AP, then cot(C/2) =

1) 3 tan(A/2)
2) 3 tan(B/2)
3) 3 cot(A/2)
4) 3 cot(B/2)

Answer 1

2) 3 tan(B/2) is the answer