Can someone help me solve this integral? (1/(1+e^x))dx

[rockfan0005@g]

Help W/ Integration--Calc 1

Hey everybody,
I have a problem that I don't know how to solve...can someone help me out:
Integral (1/(1+e^x))dx

 

[jeffreydk]

Try using substitution first for u=e^x which will give you

\int \frac{du}{u(1+u)}
and then use partial fractions to get some A,B where

\int \frac{A}{u}du + \int \frac{B}{1+u}du

and from there try and see if you can find a solution.

 

[rock.freak667]

You can use the substitution jeffreydk said or use u=1+e^x. Both are fine.

 

[rockfan0005@g]

Thanks guys, so much...answer wasn't too difficult after that.