$\cot ^{-1}\left(\frac{1}{\sqrt{x^2-1}}\right)=$ . . . . . . जहाँ,$x>1$.

  • A
    $\sec ^{-1} x$
  • B
    $\sin ^{-1} x$
  • C
    $\operatorname{cosec}^{-1} x$
  • D
    $\cos ^{-1} x$

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यदि $\theta = \tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{1}{7}\right) + \tan^{-1}\left(\frac{1}{13}\right) + \tan^{-1}\left(\frac{1}{21}\right) + \tan^{-1}\left(\frac{1}{31}\right)$,तो $\tan \theta =$

$\cot^{-1} \left[ \frac{\sqrt{1 - \sin x} + \sqrt{1 + \sin x}}{\sqrt{1 - \sin x} - \sqrt{1 + \sin x}} \right]$ का मान क्या है, जहाँ $x \in (0, \frac{\pi}{2})$ है?

यदि $y = \sin^{-1}x + \sin^{-1}\sqrt{1-x^2}$,जहाँ $-1 \le x \le 1$ है,तो $\frac{dy}{dx}$ ज्ञात कीजिए।

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$\lim _{x \rightarrow 0^{+}} \frac{x \sin ^{-1}\left(\frac{2 x}{1+x^2}\right)}{\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) \tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)}$ का मान ज्ञात कीजिए।

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