यदि $\cos 2\theta = \sin \alpha$ है,तो $\theta =$

  • A
    $n\pi \pm (\frac{\pi}{2} - \alpha), n \in \mathbb{Z}$
  • B
    $n\pi \pm (\frac{\pi}{4} + \frac{\alpha}{2}), n \in \mathbb{Z}$
  • C
    $\frac{1}{2}[n\pi + (-1)^n \alpha], n \in \mathbb{Z}$
  • D
    $n\pi \pm (\frac{\pi}{4} - \frac{\alpha}{2}), n \in \mathbb{Z}$

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