trigonometry

Question: In any triangle ABC, the value of $a({{b}^{2}}+{{c}^{2}})\cos A+b({{c}^{2}}+{{a}^{2}})\cos B+c({{a}^{2}}+{{b}^{2}})\cos C$ is

1) $3ab{{c}^{2}}$

2) $3{{a}^{2}}bc$

3) $3abc$

4) $3a{{b}^{2}}c$

Solution:

Explanation: No Explanation

Relation between sides and angles Solutions of triangles

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