# Math Help - Integration

1. ## Integration

$\int \frac{e^x}{1+e^{2x}}$

Could someone explain how to solve this?

2. Make the sub $u=e^{x}, \;\ du=e^{x}dx$

After making the subs, the resulting integral should look familiar and a cakewalk from there on out.

3. Originally Posted by Haris
$\int \frac{e^x}{1+e^{2x}}\,$

Could someone explain how to solve this?
$\int \frac{e^x}{1+e^{2x}}\,dx$ (note the dx - it's important)

Try letting $u = e^x$

4. $I=tan^{-1}(e^x)$

Is that correct?

5. Originally Posted by Haris
$I=tan^{-1}(e^x) + c$

Is that correct?