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If ABC is a triangle and tan"" (A)/(2) ,...

If ABC is a triangle and `tan"" (A)/(2) , tan"" (B)/(2) , tan "" (C )/( 2)` are in H.P. then the minimum value of `cot"" (B)/(2)` is equal to

A

`-sqrt(3)`

B

`sqrt(3)`

C

2

D

`-2`

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The correct Answer is:
B
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