Hey everyone! I'm deciding whether to major in Economics, Business Finance, or Chemical Engineering, and what I know about the three is that they all require plenty of knowledge in mathematics (Chem. Engineering especially). I wanted to take Calculus 1 next semester, but my couselor suggested that I take it easy next semester because of my problems with stress, and told me to take a course in Critical Thinking instead. My question is: to prevent my skills in Precalculus from becoming rusty, would it help if I buy myself both a used Trigonometry and Precalculus textbook? Or what else could prevent my preparations for Calculus from fading?