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

If 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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