If `A+B+C = 180^0 `, Prove that : `sin^2 (A/2) + sin^2 (B/2) + sin^2 (C/2) =1-2 sin (A/2) sin
Channel: Doubtnut
Date: 2020-04-12

If `A+B+C = 180^0 `, Prove that : `sin^2 (A/2) + sin^2 (B/2) + sin^2 (C/2) =1-2 sin (A/2) sin (B/2) sin (C/2)`