यदि $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$, तो $\frac{d^2 y}{d x^2}=$

  • A
    $-\frac{b^4}{a^2 y^3}$
  • B
    $\frac{b^2}{a y^2}$
  • C
    $\frac{-b^3}{a^2 y^3}$
  • D
    $\frac{b^3}{a^2 y^2}$

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