The set of values of $x$ for which the expression $\frac{{\tan 3x - \tan 2x}}{{1 + \tan 3x\tan 2x}} = 1$, is

  • A

    $\phi $

  • B

    $\frac{\pi }{4}$

  • C

    $\left\{ {n\pi + \frac{\pi }{4}:n = 1,\,2,\,3.....} \right\}$

  • D

    $\left\{ {2n\pi + \frac{\pi }{4}:n = 1,\,2,\,3.....} \right\}$

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