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If a ,b ,c denote the lengths of the ...

If `a ,b ,c` denote the lengths of the sides of a triangle opposite to angles `A ,B ,C` respectively of a ` A B C ,` then the correct relation among `a ,b , cA ,Ba n dC` is given by `(b+c)sin((B+C)/2)=acos` b. `(b-c)cos(A/2)=asin((B-C)/2)` c. `(b-c)cos(A/2)=2asin((B-C)/2)` d. `(b-c)sin((B-C)/2)="a c o s"A/2`

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