trigonometry

Question: In a $\Delta ABC$ , $a,\ b,\ A$ are given and ${{c}_{1}},\ {{c}_{2}}$ are two values of the third side c. The sum of the areas of two triangles with sides $a,\ b,\ {{c}_{1}}$ and $a,b,\ {{c}_{2}}$ is



1) $\frac{1}{2}{{b}^{2}}\sin 2A$
2) $\frac{1}{2}{{a}^{2}}\sin 2A$
3) ${{b}^{2}}\sin 2A$
4) None of these
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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