$\frac{1-\cos 2 \theta+\sin 2 \theta}{1+\cos 2 \theta+\sin 2 \theta}=$

  • A
    $\cot \theta$
  • B
    $\cos 2 \theta$
  • C
    $\tan \theta$
  • D
    $\tan 2 \theta$

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