यदि $\sqrt{x-xy} + \sqrt{y-xy} = 1$ है,तो $\frac{dy}{dx} = $

  • A
    $-\sqrt{\frac{y-y^2}{x-x^2}}$
  • B
    $-\sqrt{\frac{1-y^2}{1-x^2}}$
  • C
    $-\sqrt{\frac{1-y}{1-x}}$
  • D
    $-\sqrt{\frac{x-y}{x+y}}$

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