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