$\sec ^2(\tan ^{-1} 2)+\operatorname{cosec}^2(\cot ^{-1} 3) = $ . . . . . . .

  • A
    $5$
  • B
    $6$
  • C
    $13$
  • D
    $15$

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

$\frac{d}{dx}(\sin^{-1}(3x - 4x^3)) = $

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