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let A, B, C are angles of a triangle and...

let A, B, C are angles of a triangle and `tan ""A/2=1/3,tan ""B/2=2/3,` then the value of `tan ""C/2 ` is-

A

`7/9`

B

`2/9`

C

`4/3`

D

`3/4`

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A
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