trigonometry

Question: Which is true in the following

1) $a\cos A+b\cos B+c\cos C=R\sin A\sin B\sin C$

2) $a\cos A+b\cos B+c\cos C=2R\sin A\sin B\sin C$

3) $a\cos A+b\cos B+c\cos C=4R\sin A\sin B\sin C$

4) $a\cos A+b\cos B+c\cos C=8R\sin A\sin B\sin C$

Solution:

Explanation: No Explanation

Circle connected with triangle

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