- #1

- 26

- 0

## Homework Statement

integrate 1/(1+e^x) dx

## Homework Equations

## The Attempt at a Solution

firstly i let t=1+e^x

and then i come to : integrate 1/(t^2-1)

and then i put t=secx

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but then the final ans is -1/2 ln | 2/e^x +1 |

it should be 1 instead of 2, i hv checked for the steps for so many times, but found nothing wrong