In a DeltaABC, the value of sin""(A+B)/(...

In a `DeltaABC`, the value of `sin""(A+B)/(2)` is equal to

A

`cos""(C )/(2)`

B

`tan""(C )/(2)`

C

`cot""(B)/(2)`

D

`"cosec"(A)/(2)`

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The correct Answer is:

A

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