यदि $\sqrt{\frac{x}{y}}+\sqrt{\frac{y}{x}}=4$ है,तो $\frac{d y}{d x}=$

  • A
    $\frac{y-7 x}{7 x-y}$
  • B
    $\frac{7 y-x}{y-7 x}$
  • C
    $\frac{7 x+y}{x-7 y}$
  • D
    $\frac{y+7 x}{7 y-x}$

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