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

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

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