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Course: Trigonometry
Topic: Circular Functions
Subtopic: The Unit Circle

Overview

The unit circle developed in this section is probably the most widely useful item in all of trigonometry. It provides an easy way to know the trig functions of all the "nice" angles from 0° to 360°. It will be used throughout the rest of this class, calculus, and differential equations. Understand it, memorize it, use it!

Objectives

By the end of this topic you should know and be prepared to be tested on:

Terminology

Define: unit circle