यदि $(1+\tan \alpha)(1+\tan 4 \alpha)=2$ और $\alpha \in \left(0, \frac{\pi}{16}\right)$ है,तो $\alpha$ का मान ज्ञात कीजिए।

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

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