$\int \frac{dx}{e^x + e^{-x}} = $

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

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