In my high school, I remember being introduced to functions of that type in Algebra II and at the very latest trigonometry (sines and cosines). While a knowled

In my high school, I remember being introduced to functions of that type in Algebra II and at the very latest trigonometry (sines and cosines). While a knowledge of functions is vital to understanding Calculus (the fundamental theorem of calculus depends on them), it's only a small component of the bigger picture. Calculus is mainly about how functions change with respect to some other variable (time is common) and the inverse of that operation.