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

  • A
    $2 \sin \theta$
  • B
    $2 \cos \theta$
  • C
    $\frac{2}{|\cos \theta|}$
  • D
    $\frac{2}{|\sin \theta|}$

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