यदि $y = \frac{\sqrt{x^2 + 1} + \sqrt{x^2 - 1}}{\sqrt{x^2 + 1} - \sqrt{x^2 - 1}}$ है,तो $\frac{dy}{dx} = $

  • A
    $2x + \frac{2x^3}{\sqrt{x^4 - 1}}$
  • B
    $2x + \frac{x^3}{\sqrt{x^4 - 1}}$
  • C
    $x + \frac{2x^3}{\sqrt{x^4 - 1}}$
  • D
    इनमें से कोई नहीं

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

यदि $y = \frac{x}{2}\sqrt{a^2 + x^2} + \frac{a^2}{2}\log(x + \sqrt{x^2 + a^2})$ है,तो $\frac{dy}{dx} = $

यदि $f: R \rightarrow R$ बिंदु $a \in R$ पर एक अवकलनीय फलन है, जहाँ $f^{\prime}(a)=a f(a)$, तो $\lim _{x \rightarrow a} \frac{x f(a)-a f(x)}{x-a}=$

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