$ \int_0^{\frac{\pi}{2}} \frac{\sin x-\cos x}{1-\sin x \cos x} d x = $

  • A
    $ \frac{\pi}{4} $
  • B
    $ \frac{2}{\pi} $
  • C
    $ 0 $
  • D
    $ \frac{\pi}{2} $

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