यदि $\tan \alpha = \frac{1}{7}$ और $\sin \beta = \frac{1}{\sqrt{10}}$ जहाँ $0 < \alpha, \beta < \frac{\pi}{2}$ है,तो $2\beta$ का मान ज्ञात कीजिए:

  • A
    $\frac{\pi}{4} - \alpha$
  • B
    $\frac{3\pi}{4} - \alpha$
  • C
    $\frac{\pi}{8} - \frac{\alpha}{2}$
  • D
    $\frac{3\pi}{8} - \frac{\alpha}{2}$

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