In any `DeltaABC`, prove that `(b+c-a) (cot ,B/2 + cot, C/2) = 2a cot, A/2`
Channel: Doubtnut
Date: 2020-04-12

In any `DeltaABC`, prove that `(b+c-a) (cot ,B/2 + cot, C/2) = 2a cot, A/2`