Mark the correct alternative in each of the following:In any ∆ABC, 2 – InterviewSolution

1.	Mark the correct alternative in each of the following:In any ∆ABC, 2(bc cosA + ca cosB + ab cosC) =(a) abc (b) a+b+c (c) a2+b2+c2 (d) 1a2+1b2+1c2
Answer» Mark the correct alternative in each of the following: In any ∆ABC, 2(bc cosA + ca cosB + ab cosC) = (a) $a b c$ (b) $a + b + c$ (c) $a^{2} + b^{2} + c^{2}$ (d) $\frac{1}{a^{2}} + \frac{1}{b^{2}} + \frac{1}{c^{2}}$

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