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In triangle ABC the value of (cot frac (...

In triangle ABC the value of `(cot frac (A)(2) cot frac (B)(2)-1) /(cot frac (A)(2) cot frac (B)(2))` is :

A

`a/(a+b+c)`

B

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

C

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

D

`(2b)/(a+b+c)`.

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