કિંમત શોધો: $\tan A + \cot (180^\circ + A) + \cot (90^\circ + A) + \cot (360^\circ - A)$

  • A
    $0$
  • B
    $2 \tan A$
  • C
    $2 \cot A$
  • D
    $2(\tan A - \cot A)$

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