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If A+B +C =2S, prove that : sin (S - A) ...

If A+B +C =2S, prove that : `sin (S - A) + sin (S- B) + sin (S-C)-sinS= 4 sin frac (A)(2) sin frac (B)(2) sin frac (C)(2)`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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