यदि दो कोण $\alpha, \beta$ इस प्रकार हैं कि $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ और $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,तो $(2 \alpha+\beta)=$

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{\pi}{6}$
  • C
    $\frac{3 \pi}{4}$
  • D
    $\frac{\pi}{4}$

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