$\int e^{\tan ^{-1} x} \cdot \frac{1+x+x^2}{1+x^2} dx$ का मान ज्ञात कीजिए।

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

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