I can't seem to solve this seemingly simple integral. It's probably easy but I don't see it. Anyone care to try? Thanks.

Integral of (e^x)*(e^(e^x)) dx

2. let $\displaystyle u = e^x$

$\displaystyle du = e^x \, dx$

$\displaystyle \int e^x \cdot e^{e^x} \, dx$

substitute ...

$\displaystyle \int e^u \, du$

now finish.

3. Oh, thanks.

I feel stupid now. Lol.