Greetings, Sure wish I found this forum like two years ago! Anyways, as my cherry-popping post I shall seek knowledge for the fore-going: The anti-derivative for xcos(x)? I was able to do (2x)cos(x^2) = sin(x^2), but xcos(x) has boggled me. I am not seeing it. Can anyone give me the answer and a good strategy/rule of thumb for tackling similar anti-derivatives? Thanks a million!