What if the proof for differentiating and integrating e^x. For d/dx (e^x) i used the chin rule and did u = x y = e^u dy/du = ue^u-1 du/dx = 1 dy/du*du/dx = ue^u-1 so you get xe^x-1 but thats not right. I don't even know where to start with intergration. Can any one show me? Thanks (also where are all the symbols have gone? I Don't know how to put them in anymore.) *edit* Sorry I didn't realise this wasn't home work help section. Can a moderator move it there please.