The general solution of the trigonometric equation $\tan x + \tan 2x + \tan 3x = \tan x \cdot \tan 2x \cdot \tan 3x$ is

  • A
    $x = n\pi$
  • B
    $x = n\pi \pm \frac{\pi}{3}$
  • C
    $x = 2n\pi$
  • D
    $x = \frac{n\pi}{3}$,where $n \in I$

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