I don't know where my head was, but I just found out that differential calculus is not taught in calc II - it's a separate class. I had no idea. So basically i have wasted my $ applying to Wash U, since I have only taken Calc. I and that was 5 years ago. There's no way I can take Calc II then Diff. Calc by August, just for a school that may not even interview me! Just curious, for those of you who applied to Wash U, what made you take 3 semesters of calc in undergrad...were you math majors? Is Diff. Calc. hard?