The following formula comes from the wiki here on the constant "e"

http://upload.wikimedia.org/math/f/1...365ad2c211.png

where they substitute u=h/x in the last step for the 3rd equation. i've been grinding away, but can't figure out how they ended with that they went from the second equation to the third...i feel like i'm missing something obvious... any help would be greatly appreciated!http://en.wikipedia.org/wiki/E_%28ma...nt%29#Calculus