I just started taking Calc 2 this semester. So far most has been review. The problem is everything we're doing involves u-sub. For the life of me I forget how to do it. I've tried going back and work on the u-sub section in my book, but no luck. I'm starting to panic and worry. I understand there is no sureshot for me to learn this again, but could maybe someone give me some pointers or lead me to a webpage that explains it at a noob level?