જો $y = x \log \left( \frac{x}{a + bx} \right)$ હોય,તો $x^3 \frac{d^2y}{dx^2} = $

  • A
    $x \frac{dy}{dx} - y$
  • B
    $\left( x \frac{dy}{dx} - y \right)^2$
  • C
    $y \frac{dy}{dx} - x$
  • D
    $\left( y \frac{dy}{dx} - x \right)^2$

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