AP Calculus BC (year-long) is primarily concerned with developing the students' understanding of the concepts of calculus and providing experience with its methods and applications. The course emphasize a multirepresentational approach to calculus, with concepts, results, and problems being expressed graphically, numerically, analytically, and verbally. The connections among these representations also are important. Calculus BC is an extension of Calculus AB rather than an enhancement; common topics require a similar depth of understanding. The focus of the courses is neither manipulation nor memorization of an extensive taxonomy of functions, curves, theorems, or problem types. Thus, although facility with manipulation and computational competence are important outcomes, they are not the core of the course. Through the use of the unifying themes of derivatives, integrals, limits, approximation, and applications and modeling, the course becomes a cohesive whole rather than a collection of unrelated topics. College Board recommends the following pre-requisites: completion of four years of secondary mathmatics designed for college bound students in which they study algebra, geometry, trigonometry, analytic geometry, and analytic functions.