$\int e^x \left( \frac{1-x}{1+x^2} \right)^2 dx = $ . . . . . . + $C$

  • A
    $-\frac{e^x}{1+x^2}$
  • B
    $\frac{e^x}{1+x^2}$
  • C
    $\frac{e^x}{(1+x^2)^2}$
  • D
    $\frac{e^x}{1+x}$

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