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

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

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