trigonometry

Question: In$\Delta \,ABC$ ,$({{b}^{2}}-{{c}^{2}})\cot A+({{c}^{2}}-{{a}^{2}})\cot B+({{a}^{2}}-{{b}^{2}})\cot C=$

1) 0

2) ${{a}^{2}}+{{b}^{2}}+{{c}^{2}}$

3) $2\,({{a}^{2}}+{{b}^{2}}+{{c}^{2}})$

4) $\frac{1}{2abc}$

Solution:

Explanation: No Explanation

Relation between sides and angles Solutions of triangles

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