श्रेणी $\cot^{-1} 3 + \cot^{-1} 7 + \cot^{-1} 13 + \cot^{-1} 21 + \dots$ के प्रथम $n$ पदों का योग क्या है?

  • A
    $\tan^{-1} \left( \frac{n}{n+2} \right)$
  • B
    $\cot^{-1} \left( \frac{n+2}{n} \right)$
  • C
    $\tan^{-1}(n+1) - \tan^{-1} 1$
  • D
    उपरोक्त सभी

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

$\frac{d}{dx} \left[ \tan^{-1} \left( \frac{a - x}{1 + ax} \right) \right] = $

यदि $3 \sin ^{-1}\left(\frac{2 x}{1+x^2}\right)-4 \cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)+2 \tan ^{-1}\left(\frac{2 x}{1-x^2}\right)=\frac{\pi}{3}$ है,तो $x$ का मान ज्ञात कीजिए।

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