The general solution of $\tan 3x = 1$ is

  • A

    $n\pi + \frac{\pi }{4}$

  • B

    $\frac{{n\pi }}{3} + \frac{\pi }{{12}}$

  • C

    $n\pi $

  • D

    $n\pi \pm \frac{\pi }{4}$

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