$\cot \left(\sum_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^2}\right)\right) = $

  • A
    $\frac{26}{25}$
  • B
    $\frac{25}{26}$
  • C
    $\frac{50}{51}$
  • D
    $\frac{52}{51}$

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मान ज्ञात कीजिए: ${\cot ^{ - 1}}3 + {\csc ^{ - 1}}\sqrt 5 = $

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}} = $

$\tan ^{-1} \sqrt{3} - \cot ^{-1}(-\sqrt{3}) = $ . . . . . . .

$S = \tan^{-1}\left( \frac{1}{n^2 + n + 1} \right) + \tan^{-1}\left( \frac{1}{n^2 + 3n + 3} \right) + \dots + \tan^{-1}\left( \frac{1}{1 + (n + 19)(n + 20)} \right)$ है,तो $\tan S$ का मान ज्ञात कीजिए।

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

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