$\cot ^{ - 1}\left[ \frac{\sqrt {1 - \sin x} + \sqrt {1 + \sin x}}{\sqrt {1 - \sin x} - \sqrt {1 + \sin x}} \right] = $

  • A
    $\pi - x$
  • B
    $2\pi - x$
  • C
    $\frac{x}{2}$
  • D
    $\pi - \frac{x}{2}$

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