$\int \frac{d x}{\left(e^x+e^{-x}\right)^2}=$

  • A
    $\frac{1}{2\left(e^{2 x}+1\right)}+c$
  • B
    $-\frac{1}{2\left(e^{2 x}+1\right)}+c$
  • C
    $\frac{1}{3\left(e^{2 x}+1\right)}+c$
  • D
    $\frac{1}{\left(e^{2 x}+1\right)}+c$

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