यदि $\cos \theta + \sin \theta = \sqrt{2} \cos \theta$ है,तो $\cos \theta - \sin \theta =$

  • A
    $\sqrt{2} \sin \theta$
  • B
    $2 \sin \theta$
  • C
    $-\sqrt{2} \sin \theta$
  • D
    इनमें से कोई नहीं

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