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( b+c) cos A + ( c+a) cos B +( a+b) ...

` ( b+c) cos A + ( c+a) cos B +( a+b) cos C =`

A

` 2s`

B

`s`

C

` s//2`

D

` s//3`

Text Solution

Verified by Experts

The correct Answer is:
A
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