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Calculus IV
15.Functions of Several Variables
16.Multiple Integration
17.Vector Analysis
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Course: Trigonometry
Topic: Trigonometric Identities
Subtopic: Double-Angle Identities

Overview

Continuing to expand our arsenal of useful trigonometric formulae, in today's lesson we study the double-angle identities which expand trig functions of a double-angle such as cos(2x). These are some of the most useful identities of all.

Objectives

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

Terminology

Define: double-angle

You do not need to memorize these DOUBLE ANGLE IDENTITIES.
You do need to know how to apply them. Keep a copy handy.

Supplementary Resources (optional)

Mini-Lesson: Double Angle Identities
Examples:  Simplify and Evaluate a Trig Expression Using a Double Angle Identity
Example 1:  Determine Double Angle Trig Function Values Given Information
Example 2:  Determine Double Angle Trig Function Values Given Information