trigonometry

Question: Which of the following is true in a triangle ABC



1) $(b+c)\sin \frac{B-C}{2}=2a\cos \frac{A}{2}$
2) $(b+c)\cos \frac{A}{2}=2a\sin \frac{B-C}{2}$
3) $(b-c)\cos \frac{A}{2}=a\sin \frac{B-C}{2}$
4) $(b-c)\sin \frac{B-C}{2}=2a\cos \frac{A}{2}$
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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