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If A+B+C=pi, Prove that : sin( A/2) + si...

If `A+B+C=pi`, Prove that : `sin( A/2) + sin( B/2) + sin(C/2) =1 + 4 sin( (B+C)/(4)) sin( (C+A)/(4)) sin( (A+B)/(4))`

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