The general solution of $\frac{{\tan \,2x\, - \,\tan \,x}}{{1\, + \,\tan \,x\,\tan \,2x}}\, = \,1$ is 

  • A

    $\phi $

  • B

    $n\pi  \pm \frac{\pi }{3}$

  • C

    $n\pi  + \frac{\pi }{4}$

  • D

    $n\pi  + \frac{\pi }{6}\left( {n \in z} \right)$

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