यदि $\cos \theta - \sin \theta = \sqrt{5} \sin \theta$ है,तो $\cos \theta + \sin \theta = $

  • A
    $\sqrt{5} \cos \theta$
  • B
    $\sqrt{5} \sin \theta$
  • C
    $5 \sin \theta$
  • D
    $5 \cos \theta$

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