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In triangle A B C ,a , b , c are the len...

In triangle `A B C ,a , b , c` are the lengths of its sides and `A , B ,C` are the angles of triangle `A B Cdot` The correct relation is given by (a)`(b-c)sin((B-C)/2)=acosA/2` (b) `(b-c)cos(A/2)=asin((B-C)/2)` (c)`(b+c)sin((B+C)/2)=acosA/2` (d)`(b-c)cos(A/2)=2asin(B+C)/2`

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