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

  • A
    $2 \sec \theta$
  • B
    $2 \operatorname{cosec} \theta$
  • C
    $2 \tan \theta$
  • D
    $2 \cot \theta$

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