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If A+B+C = 180^0 , Prove that : sin^2 (A...

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)`

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