In DeltaABC,"if "2s=a+b+c, then the valu...

In `DeltaABC,"if "2s=a+b+c`, then the value of `(s(s-a))/(bc)-((s-b)(s-c))/(bc)`=

A

(a) `sinA`

B

(b) `cosA`

C

(c) `tanA`

D

(d) `-cosA`

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The correct Answer is:

B

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