Q .     If ` \tan \theta =\frac { 1 }{ 2 }` and ` \tan \phi =\frac { 1 }{ 3 }`, then the value of `\theta +\phi` is:

VIT 2015
A

`frac { \pi }{ 6 }`

B

`\pi`

C

` 0`

D

`frac { \pi }{ 4 }`

HINT

use `\therefore \quad \tan ( \theta +\phi ) =\frac { \tan \theta +\tan \phi }{ 1-\tan \theta .\tan \phi }`

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