# Topic 3.1 The Inverse Functions of Sine and Cosine

*The Inverse Functions of Sine and Cosine* introduces the inverses to the basic trig functions. These functions [latex]y= \sin^{-1} (x)[/latex] and [latex]y= \cos^{-1} (x)[/latex] are also denoted [latex]y = \arcsin (x)[/latex] and [latex]y = \arccos (x)[/latex] respectively, as is mentioned in *Right Triangle Geometry*. It relies on the unit circle values found in *The Unit Circle – Part I* and *Part II*. It is helpful to have an understanding of how the graph of a function illustrates the domain and range of a function, and further details of the domain and range of the inverse trig functions are given in *Domain and Range of Trig and Inverse Trig Functions.*