What next?

1. Apr 23, 2005

i'm having trouble rewriting this integral:$$\int\frac{e^x}{e^{2x} + 1}$$ so that it will be in the arctan formula: should i use long divison here? if it were not for the $$e^x$$ in the numerator i'd be fine.

Last edited: Apr 23, 2005
2. Apr 23, 2005

whozum

$$u = e^{x}, du = e^{x}dx$$

$$e^{2x} = (e^{x})^2$$

3. Apr 23, 2005

you never get away from u -substitutions do !!!! thanks

4. Apr 23, 2005

whozum

Why woudl you watn to get away from them? They save your ass alot :)
Learn to love em.

5. Apr 23, 2005