Part 2
Trig Is the Key: Basic Review, the Unit Circle, and Graphs
IN THIS PART …
You should be familiar with the basics of trigonometry from earlier math classes — right triangles, trig ratios, and angles, for example. But your Algebra II course may or may not have expanded on those ideas to prepare you for the direction that pre-calculus is going to take you. For this reason, it's assumed that you’ve never seen this stuff before. You won't be left behind when continuing your mathematics journey.
This part begins with trig ratios and word problems and then moves on to the unit circle: how to build it and how to use it. You’ll some trig equations and make and measure arcs. Graphing trig functions is a major component of pre-calculus, so you'll see how to graph each of the six functions.
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