In any triangle ABC prove that the identities- sin 2A-sin 2B-sin 2Ccos A-cos B-cos C-1-8cosA-2cos B-2cos C-2-

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Polar Representation of a Complex Number

In any triang...

Question

In any triangle ABC prove that the identities.
$\frac{sin 2 A + sin 2 B + sin 2 C}{cos A + cos B + cos C - 1} = 8 cos (A / 2) cos (B / 2) cos (C / 2)$ .

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