Q .     If `\tan \theta . \tan (120^{\circ} - \theta).\tan (120^{\circ} + \theta) = \ frac {1}{\sqrt {3}}`, then `\theta =`

EAMCET 2015
A

`\ frac {n\pi}{3} + \ frac {\pi}{18}, n\epsilon Z`

B

`\ frac {n\pi}{3} + \ frac {\pi}{12}, n\epsilon Z`

C

`\ frac {n\pi}{12} + \ frac {\pi}{12}, n\epsilon Z`

D

`\ frac {n\pi}{3} + \ frac {\pi}{6}, n\epsilon Z`

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