यदि $\sqrt{x+y}+\sqrt{y-x}=5$,तो $\left(\frac{d^{2} y}{d x^{2}}\right)=$

  • A
    $\frac{2}{25}$
  • B
    $\frac{2}{5}$
  • C
    $\frac{-2}{5}$
  • D
    $\frac{-2}{25}$

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यदि $y=f(\cosh x)$ और $f^{\prime}(x)=\log \left(x+\sqrt{x^2-1}\right)$ है, तो $\frac{d^2 y}{d x^2}=$

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