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

  • A
    $\sec^2 x$
  • B
    $-\sec^2 \left( \frac{\pi}{4} - x \right)$
  • C
    $\sec^2 \left( \frac{\pi}{4} + x \right)$
  • D
    $\sec^2 \left( \frac{\pi}{4} - x \right)$

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