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

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

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