$\frac{1-\sin \theta+\cos \theta}{1-\sin \theta-\cos \theta} = $

  • A
    $\cot \frac{\theta}{2}$
  • B
    $-\cot \frac{\theta}{2}$
  • C
    $\tan \frac{\theta}{2}$
  • D
    $-\tan \frac{\theta}{2}$

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