איך עושים אינטגרל לe^ (e^x)*e^x?

http://www.wolframalpha.com/input/?i=e%5e+%28e%5ex%29*e%5exdx&dataset=

http://latex.codecogs.com/png.latex?%5c%5c%5cint%20e%5e%7be%5ex%7d%5ccdot%20e%5ex%20%5c%20dx%5cleftrightarrow%20%5cint%20e%5e%7be%5ex+x%7d%20%5c%20dx%5c%5c%5c%5c%20u%3de%5ex%20%5c%20%5c%20%5c%20%5c%20du%3de%5ex%20%5c%20dx%5c%5c%5c%5c%20%5cint%20e%5eu%20%5c%20du%5c%5c%5c%5c%20e%5eu+c%5c%5c%5c%5c%20%5cboldsymbol%7b%7b%5ccolor%7bdarkgreen%7d%20e%5e%7be%5ex%7d+c%7d%7d