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

  • A
    $\frac{-3 \pm \sqrt{17}}{4}$
  • B
    $-1 \pm \sqrt{3}$
  • C
    $\sqrt{3}-1$
  • D
    $\frac{\sqrt{17}-3}{4}$

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यदि $y = \tan^{-1} \frac{x}{1+2x^2} + \tan^{-1} \frac{x}{1+6x^2} + \tan^{-1} \frac{x}{1+12x^2}$ है,तो $\left(\frac{dy}{dx}\right)_{x=\frac{1}{2}} = $

$\sin ^{-1} \frac{12}{13}+\cos ^{-1} \frac{4}{5}+\tan ^{-1} \frac{63}{16}$ का मान क्या है?

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