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For any triangle ABC, prove thatsin(B-C)...

For any triangle ABC, prove that`sin(B-C)/2=(b-c) /a ( cosA/2)`

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To prove that \[ \frac{\sin\left(\frac{B - C}{2}\right)}{1} = \frac{b - c}{a} \cdot \cos\left(\frac{A}{2}\right) \] for any triangle ABC, we will use the sine rule and some trigonometric identities. ...
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