If \( A+B+C=\pi \), prove that \( \frac{\cos A}{\sin B \sin C}+\frac{\cos B}{\sin C \sin A}+\fra...

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If `A+B+C =pi ,` prove that `sin 2A+sin 2B+sin 2C=4 sin Asin B sin C.` If `A+B+C =pi ,` prove that `sin 2A+sin 2B+sin 2C=4 sin Asin B sin C.`
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