sum (a)/( s-a) (tan ""(B)/(2) - tan ""(...

` sum (a)/( s-a) (tan ""(B)/(2) - tan ""(C )/(2))` =

A

`- (1)/(2) `

B

` -1`

C

` 1`

D

`0 `

Verified by Experts

The correct Answer is:

D

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