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Question

Question: In ∆ABC, if 2(bccos A + cacos B + abcos C) =...

In ∆ABC, if 2(bccos A + cacos B + abcos C) =

A

0

B

a + b + c

C

a2 + b2 + c2

D

None of these

Answer

a2 + b2 + c2

Explanation

Solution

2(bc cos A + ca cos B + ab cos C)

= 2

= a2 + b2 + c2