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

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

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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