$\int \frac{e^{2x}-1}{e^{2x}+1} dx = $ . . . . . . $+ C$.

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

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