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In triangle ABC if a,b,c are sides oppos...

In triangle ABC if a,b,c are sides opposite of angles A, B, C respectivgely, then which of the following is correct ?

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
D
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