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

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

A

sin A

B

cos A

C

tan A

D

None of these

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The correct Answer is:
B
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