`int(dx)/(e^(x)+e^(-x))` is equal to :

Options

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`

Answer

A