$\tan \left( \frac{\pi }{4} + \theta \right) - \tan \left( \frac{\pi }{4} - \theta \right) = $

  • A
    $2\tan 2\theta $
  • B
    $2\cot 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\cot 2\theta $

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