જો $\cos \theta + \sin \theta = \sqrt{2} \cos \theta$ હોય,તો $\cos \theta - \sin \theta =$

  • A
    $\sqrt{2} \sin \theta$
  • B
    $2 \sin \theta$
  • C
    $-\sqrt{2} \sin \theta$
  • D
    આમાંથી કોઈ નહીં

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$\cos 41^{\circ} \cdot \cos 42^{\circ} \cdot \cos 43^{\circ} \cdot \cos 44^{\circ} \cdot \cos 45^{\circ} \cdot \cos 46^{\circ} \cdot \cos 47^{\circ} \cdot \cos 48^{\circ} \cdot \cos 49^{\circ}$ ની કિંમત શોધો.

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