यदि $y = \tan^{-1} \sqrt{x^{2}-1}$ है,तो अनुपात $\frac{d^{2} y}{dx^{2}} : \frac{dy}{dx}$ है

  • A
    $\frac{x(x^{2}-1)}{1+2x^{2}}$
  • B
    $\frac{1-2x^{2}}{x(x^{2}-1)}$
  • C
    $\frac{1+2x^{2}}{x(x^{2}+1)}$
  • D
    $\frac{x(x^{2}+1)}{1-2x^{2}}$

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