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If A+B+C=180^(circ) then the value of co...

If `A+B+C=180^(circ)` then the value of `cot (A)/(2)+cot (B)/(2)+cot (C)/(2)=`

A

`cot (A)/(2) . cot (B)/(2) . cot (C)/(2)`

B

`4 cot (A)/(2) . cot (B)/(2) . cot (C)/(2)`

C

`2 cot (A)/(2) . cot (B)/(2) . cot (C)/(2)`

D

`8 cot (A)/(2) . cot (B)/(2) . cot (C)/(2)`

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