1.

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

Answer»

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

Answer :B


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