trigonometry

Question: In $\Delta ABC$ , $\frac{\cos A}{a}+\frac{\cos B}{b}+\frac{\cos C}{c}=$

1) $\frac{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}{abc}$

2) $\frac{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}{2abc}$

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

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

Solution:

Explanation: No Explanation

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