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Question

If A + B + C = 180 then sin 2A + sin 2B + sin 2C =

A
sin A sin B sin C
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B
4 sin A sin B sin C
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C
3 sin A sin B sin C
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D
2 sin A sin B sin C
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Solution

The correct option is B 4 sin A sin B sin C
G.E = 2 sin(A+B) cos (A B) + 2 sin C cos C = 2 sin C (cos (A – B) – cos (A + B)) = 4 sin A sin B sin C.

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