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

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

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જો $0 \leq A, B \leq \frac{\pi}{4}$ અને $\cot A + \cot B + \tan A + \tan B = \cot A \cot B - \tan A \tan B$ હોય,તો $\sin(A + B) = $

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