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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

`(1)/(3)`

B

`(2)/(3)`

C

`(2)/(9)`

D

`(7)/(9)`

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The correct Answer is:
D
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