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In a DeltaABC, tan ""1/2 (A+B) . Cot""1/...

In a `DeltaABC, tan ""1/2 (A+B) . Cot""1/2(A-B)` is equal to

A

`(a-b)/(a+b)`

B

`(a+b)/(c )`

C

`(a+b)/(a-b)`

D

`(a-b)/(2(a+b))`

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