What are functions ? From an introduction of the basic concepts of functions to more advanced functions met in economics, engineering and the sciences, these topics provide an excellent foundation for undergraduate study.

# Hyperbolic functions

The hyperbolic functions have similar names to the trigonometric functions, but they are defined in terms of the exponential function. This unit defines the three main hyperbolic functions and sketches their graphs. Inverse functions and reciprocal functions are also considered. Video tutorial 29 mins.