If $\tan (\cot x) = \cot (\tan x),$ then $\sin 2x =$

  • A
    $\frac{(2n + 1)\pi}{4}$
  • B
    $\frac{4}{(2n + 1)\pi}$
  • C
    $4\pi(2n + 1)$
  • D
    None of these

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