$\int \frac{3 x^9+7 x^8}{\left(x^2+2 x+5 x^8\right)^2} d x=$

  • A
    $\frac{x^7}{5 x^7+x+2}+c$
  • B
    $\frac{x^7}{2\left(5 x^7+x+2\right)}+c$
  • C
    $\frac{1}{2\left(5 x^7+x+2\right)}+c$
  • D
    $\frac{-x^7}{2\left(5 x^7+x+2\right)}+c$

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