જો $(1+\tan \alpha)(1+\tan 4 \alpha)=2$ અને $\alpha \in \left(0, \frac{\pi}{16}\right)$ હોય,તો $\alpha$ ની કિંમત શોધો.

  • A
    $\frac{\pi}{20}$
  • B
    $\frac{\pi}{30}$
  • C
    $\frac{\pi}{40}$
  • D
    $\frac{\pi}{60}$

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