trigonometry

Question: In a $\Delta ABC$ , if $2s=a+b+c$ and $(s-b)(s-c)=$ $x{{\sin }^{2}}\frac{A}{2},$ then $x =$



1) bc
2) ca
3) ab
4) abc
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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