Prove that 2(bc.cos A + ca.cos B + ab.cos C) = a² + b² + c² | PROPERTIES OF TRIANGLES | INTER 1st

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Prove that:- 2(bc cosA + ca cosB + ab cosC) = (a² + b² + c²) Prove that:- 2(bc cosA + ca cosB + ab cosC) = (a² + b² + c²)
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