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

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

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