$\frac{d}{dx}\left( \frac{\cot^2 x - 1}{\cot^2 x + 1} \right) = $

  • A
    $-\sin 2x$
  • B
    $2\sin 2x$
  • C
    $2\cos 2x$
  • D
    $-2\sin 2x$

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