$\int e^{\tan^{-1} x} \left( \frac{1+x+x^2}{1+x^2} \right) dx = \rule{1cm}{0.15mm} + C$

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

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

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