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

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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The correct Answer is:
A
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