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    Triangles : Prove a Trigonometric Relation -- (b +c )cos A+(c +a) cos B+ (a + b)cos C=a+b+c

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    In any triangle ABC, prove that (b +c )cos A+(c +a) cos B+ (a + b)cos C=a+b+c.

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    Solution Preview

    Formula required: Projection Formula

    Projection Formula: In any triangle ABC, a=b ...

    Solution Summary

    A trigonometric relation involving triangles is proven in the given solution.