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Question

In ABC, if 2(bc cos A + ca cos B + ab cos C) =


A

0

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B

a+b+c

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C

a2+b2+c2

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D

None of these

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Solution

The correct option is C

a2+b2+c2


On putting the values of cos A, cos B and cos C, we get the required result i.e., a2+b2+c2.


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