$\tan 3A \cdot \tan 2A \cdot \tan A = $

  • A
    $\tan 3A + \tan 2A - \tan A$
  • B
    $\tan 3A - \tan 2A - \tan A$
  • C
    $\tan 3A + \tan 2A + \tan A$
  • D
    $\tan 3A - \tan 2A + \tan A$

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