$\operatorname{Tan}^{-1} \frac{3}{5} + \operatorname{Tan}^{-1} \frac{6}{41} + \operatorname{Tan}^{-1} \frac{9}{191} = $

  • A
    $\operatorname{Tan}^{-1} \frac{9}{10}$
  • B
    $\operatorname{Tan}^{-1} \frac{18}{19}$
  • C
    $\operatorname{Tan}^{-1} \frac{3}{191}$
  • D
    $\operatorname{Tan}^{-1} \frac{6}{205}$

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$\tan ^{-1}(x+1)+\cot ^{-1}\left(\frac{1}{x-1}\right)=\tan ^{-1}\left(\frac{8}{31}\right)$ के लिए $x$ के संभावित मानों का योग क्या है?

$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

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