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In triangle ABC, a, b, c are the lengths...

In triangle ABC, a, b, c are the lengths of its sides and A, B C are the angles of triangle ABC. The correct relation is

A

`(b + c) sin((B+C)/2) = a cos (A//2)`

B

`(b - c) cos (A//2) = a sin((B-C)//2)`

C

`(b - c) cos (A//2) = 2a sin (B+C)//2)`

D

`(b-c)sin(B-C)//2)=a cos(A//2)`

Text Solution

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The correct Answer is:
B
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