$\frac{\sqrt{2}-\sin \alpha-\cos \alpha}{\sin \alpha-\cos \alpha}=$

  • A
    $\sec \left(\frac{\alpha}{2}-\frac{\pi}{8}\right)$
  • B
    $\cos \left(\frac{\pi}{8}-\frac{\alpha}{2}\right)$
  • C
    $\tan \left(\frac{\alpha}{2}-\frac{\pi}{8}\right)$
  • D
    $\cot \left(\frac{\alpha}{2}-\frac{\pi}{2}\right)$

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