trigonometry

Question: In a triangle ABC, ${{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}\cos (A-B)=$



1) $abc$
2) $3abc$
3) $a+b+c$
4) None of these
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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