यदि $y=\frac{2}{\sqrt{a^2-b^2}} \tan ^{-1}\left[\sqrt{\frac{a-b}{a+b}} \tan \frac{x}{2}\right]$ है,तो $\left.\frac{d^2 y}{d x^2}\right|_{x=\frac{\pi}{2}}=$

  • A
    $\frac{b}{2 a^2}$
  • B
    $\frac{b}{a^2}$
  • C
    $\frac{2 b}{a}$
  • D
    $\frac{b^2}{2 a}$

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