$\tan \left(2 \tan ^{-1} \frac{1}{5} + \sec ^{-1} \frac{\sqrt{5}}{2} + 2 \tan ^{-1} \frac{1}{8}\right)$ का मान ज्ञात कीजिए।

  • A
    $1$
  • B
    $2$
  • C
    $\frac{1}{4}$
  • D
    $\frac{5}{4}$

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$\tan \left(\frac{\pi}{4}+\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)+\tan \left(\frac{\pi}{4}-\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)$ का मान ज्ञात कीजिए।

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