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Let A, B and C are the angles of a plain...

Let A, B and C are the angles of a plain triangle and `tan(A/2)=1/3,tan(B/2)=2/3` .then `tan(C/2)` is equal to

A

`7//9`

B

`2//9`

C

`1//3`

D

`2//3`

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