$2 \tan^{-1} \frac{1}{2} + \tan^{-1} \frac{1}{7}$ का मान ज्ञात कीजिए।

  • A
    $\tan^{-1} \left( \frac{17}{31} \right)$
  • B
    $\tan^{-1} \left( \frac{19}{31} \right)$
  • C
    $\tan^{-1} \left( \frac{31}{17} \right)$
  • D
    $\tan^{-1} \left( \frac{31}{19} \right)$

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समीकरण $\tan ^{-1} x+\tan ^{-1} 2 x=\frac{\pi}{4}$ को संतुष्ट करने वाला $x$ का वास्तविक मान है

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