$\int \frac{e^{\tan ^{-1} 2 x}}{1+4 x^2} dx =$

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

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