જો $\sin \theta + \cos \theta = \sqrt{2} \cos \theta$ હોય,તો $(\cos \theta - \sin \theta)$ ની કિંમત શોધો.

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

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ત્રિકોણ $ABC$ માં,જો $A = \frac{\pi}{4}$ અને $\tan B \tan C = K$ હોય,તો $K$ એ કઈ શરતનું પાલન કરવું જોઈએ?

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