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IF A+B+C =pi , then tan ((A)/(2)) tan...

IF ` A+B+C =pi `, then ` tan ((A)/(2)) tan ((B)/(2)) + tan (B/2) tan (C/2) + tan (C/2 ) tan ((A)/(2)) ` is

A

`pi /6`

B

`3`

C

`2`

D

`1`

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The correct Answer is:
D
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