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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$n > 2$ માટે તમામ શક્ય પૂર્ણાંક કિંમતોની સંખ્યા શોધો જેથી $\sin \frac{\pi}{2n} + \cos \frac{\pi}{2n} = \frac{\sqrt{n}}{2}$ થાય.

$0 < \theta < \frac{\pi}{2}$ માટે નીચેનામાંથી કયું/કયા વિધાન સાચું/સાચા છે?

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