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
    $n\pi + \frac{\pi}{6} \text{ where } n \in \mathbb{Z}$

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