Question

In ∆ABC, prove that
$sin \frac{A}{2} + sin \frac{B}{2} - sin \frac{C}{2} =\ \textless \ br /\ \textgreater \ - 1 + 4 cos \frac{\pi - A}{4} cos \frac{\pi - B}{4} sin \frac{\pi - C}{2}$​

Answer 1

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Answer 2

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