यदि $y = \frac{ax+b}{cx+d}$ और $\frac{dx}{dy} = \frac{ad-bc}{Py^2+Qy+R}$ है,तो $P+Q+R =$

  • A
    $(a+c)^2$
  • B
    $(a-c)^2$
  • C
    $\frac{ad-bc}{a^2-c^2-2ac}$
  • D
    $\frac{1}{(a-c)^2}$

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