From CollegeBoard’s AP Calculus Course description (downloaded PDF file), page 6:
“Before studying calculus, all students should complete four years of secondary
mathematics designed for college-bound students: courses in which they study
algebra, geometry, trigonometry, analytic geometry, and elementary functions. These
functions include linear, polynomial, rational, exponential, logarithmic, trigonometric,
inverse trigonometric, and piecewise-defined functions. In particular, before studying
calculus, students must be familiar with the properties of functions, the algebra of
functions, and the graphs of functions. Students must also understand the language
of functions (domain and range, odd and even, periodic, symmetry, zeros, intercepts,
and so on) and know the values of the trigonometric functions…and their multiples.”