Precalc curse, OMG!! Sometimes I don't know how to spend my free time, and that makes me boring, for that reason, I decided to change this situation. From the last week, I started with a precalc curse, is completely full of new knowledge, the thing is I'm a Designer and the maths were not part of my formation, Now I'm working with many engineers and I really want to learn more about the behavior of some materials and understand in terms of mathematics how a mechanism works. Please don't tell nobody, but I'm thinking seriously to study an engineering grade, and maybe this course could be of help. Well, I explained all my reason to spend my time in algebra and precalc. Right now I can't resolve an exercise. I will keep you inform about my progress.