Sin: The sine function, denoted by sin(x), relates angles to their corresponding y-coordinates on the unit circle.
Inverse Function: An inverse function undoes what another function does. In this case, f^-1(x) undoes what f(x) does.
Unit Circle: A circle with a radius of 1 unit centered at the origin (0,0) in a coordinate plane. It is used to understand trigonometric functions and their relationships with angles.