यदि $\sin \theta + \cos \theta = \sqrt{2} \cos \theta$ है,तो $(\cos \theta - \sin \theta)$ का मान ज्ञात कीजिए।

  • A
    $\sqrt{3} \cos \theta$
  • B
    $\sqrt{2} \sin \theta$
  • C
    $\sqrt{2} \cos \theta$
  • D
    $\sqrt{2} \sin \theta$

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