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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