यदि $a y^4 = (x + b)^5$ है,तो $\frac{y \cdot (\frac{d^2 y}{d x^2})}{(\frac{d y}{d x})^2} = $

  • A
    $5$
  • B
    $-5$
  • C
    $\frac{1}{5}$
  • D
    $\frac{-1}{5}$

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