Q 2809123018.     What is `int ( (e^x +1 )^(-1) ) dx` equal to?

A

`log (e^x +1) +C`

B

`log (e^(-x) +1 ) +C`

C

`- log (e^(-x) +1 ) +C`

D

`- ( e^x +1 ) +C`

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