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If int (e^x-1)/(e^x+1)dx=f(x)+C, then f(...

If `int (e^x-1)/(e^x+1)dx=f(x)+C,` then f(x) is equal to

A

`2log|e^(x)+1|`

B

`log|e^(2x)-1|`

C

`2log|e^(x)+1|-x`

D

`log|e^(2x)+1|`

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