यदि $\int \frac{2 x^{12}+5 x^9}{\left(1+x^3+x^5\right)^3} d x=\frac{x^m}{l\left(1+x^3+x^5\right)^r}+C$ है, तो $\frac{m-l}{r}=$

  • A
    $3$
  • B
    $4$
  • C
    $5$
  • D
    $6$

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