Yeah, sorry, that was completely my fault. If only I can erase my previous comment and substitute it with the clearer version. Brain fart, my bad!
If you've any more questions about u-substitution or other aspects of calculs, please don't feel too shy to ask! I'm sure someone will answer your questions. If not, I'll take a look - if you don't mind some waiting! (I have to be asleep in 30 minutes and I probably won't be back until after 0100 UTC May 9, 2013.) Though I will be check back on this thread for the next 3 days or so. :)
Re: I need help
If you've any more questions about u-substitution or other aspects of calculs, please don't feel too shy to ask! I'm sure someone will answer your questions. If not, I'll take a look - if you don't mind some waiting! (I have to be asleep in 30 minutes and I probably won't be back until after 0100 UTC May 9, 2013.) Though I will be check back on this thread for the next 3 days or so. :)