$\frac{d}{dx} \sqrt{\frac{1 + \cos 2x}{1 - \cos 2x}} = $

  • A
    $\sec^2 x$
  • B
    $-\csc^2 x$
  • C
    $2 \sec^2 \frac{x}{2}$
  • D
    $-2 \csc^2 \frac{x}{2}$

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