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( b- c)^(2) cos ^(2) ( A//2) + ( b+ c...

` ( b- c)^(2) cos ^(2) ( A//2) + ( b+ c) ^(2) sin ^(2) ( A//2) =`

A

`a `

B

` a ^(2) `

C

` 2a ^(2) `

D

` a ^(2) //2`

Text Solution

Verified by Experts

The correct Answer is:
B
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