The only thing which can make you excellent in calculus is solve numerous questions of differentiation and integration .
So I've been teaching myself calculus this summer, and the concepts aren't difficult, but a lot of examples, etc. require understanding of trig functions, which I don't have the best background in. I was wondering what I needed to brush up on, specifically, in order to really grasp this stuff as it relates to calculus (i don't really get derivatives of trig fxns, etc.)? any good websites I could visit? help's appreciated!