Chapter 3 – Trig Formulas and Inverse Functions

# 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 $y= \sin^{-1} (x)$ and $y= \cos^{-1} (x)$ are also denoted $y = \arcsin (x)$ and $y = \arccos (x)$ 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.

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