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The value of int (1)/(e^(x)+e^(-x))dx is...

The value of `int (1)/(e^(x)+e^(-x))dx` is

A

`tan^(-1)e^(x)`

B

`tan^(-1)e^(2x)`

C

`log(e^(x)+e^(-x))`

D

`e^(x)-e^(-x)`

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