Unit 2

Trigonometry

Introduction

Lesson 2.4: Trigonometric Identities

Although a hand drill and a power drill look very different, the effect of using either one is the same – each one produces holes. The two sides of a mathematical identity can also be thought of as two things that look different, but act the same.

In Lesson 2.4, you will

• explore the difference between trigonometric identities and equations,
• determine non-permissible values for trigonometric identities,
• verify identities,
• prove identities, and
• use identities to solve problems.
  

Coming into this Lesson, you should have

• the ability to solve trigonometric equations, and
• the ability to graph trigonometric functions.