$\int \frac{e^x \, dx}{\sqrt{1 - e^{2x}}} = $

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

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