यदि $\sqrt {1 - {x^2}} + \sqrt {1 - {y^2}} = a(x - y)$ है,तो $\frac{dy}{dx} = $

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

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