यदि $\sqrt{1-x^2}+\sqrt{1-y^2}=a(x-y)$ है, तो $\left[\left(1-x^2\right)^2 \frac{d^2 y}{d x^2}+y\left(1-x^2\right)\right] \frac{d y}{d x}=$

  • A
    $0$
  • B
    $x\left(1-y^2\right)$
  • C
    $y\left(1-x^2\right)$
  • D
    $\sqrt{1-x^2} \sqrt{1-y^2}$

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