First, there are six required lower division courses. These are generally taken during the first two years, and may be taken at a community college. Notice that the sequence begins with a calculus course; some students may need to begin with college algebra or trigonometry courses for preparation. Students taking the calculus sequence at a community college should be particularly careful about equivalencies; it may require four quarters (or three semesters) of calculus to cover the three-quarter sequence below. Information about equivalent courses at local community colleges is available from the Mathematics and Computer Science Student Center.