यदि $\log (x+y)=\log (xy)+3$ है,तो $\frac{dy}{dx}=$

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

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