$\int \frac{dx}{x(x^2+1)^3} = ?$

  • A
    $\frac{1}{2(x^2+1)} + \frac{1}{4(x^2+1)^2} + \log \sqrt{\frac{x^2}{x^2+1}} + c$
  • B
    $\frac{1}{x^2+1} + \frac{1}{2(x^2+1)^2} + \log \sqrt{\frac{x}{x^2+1}} + c$
  • C
    $\frac{1}{2(x^2+1)} + \frac{1}{4(x^2+1)^3} + \log \sqrt{\frac{x}{x+1}} + c$
  • D
    $\frac{2}{x^2+1} - \frac{1}{4(x^2+1)^2} - \log \sqrt{\frac{x}{x+1}} + c$

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