Chapter 5 Analytic Trigonometry 1

5.2 Verifying Trig Identities Objective:  Verify trigonometric identities. 2

Identity  An identity is an equation that is true for all real values in the domain of the variable.  When verifying an identity, we cannot assume the two sides of the equation are equal. We are trying to prove that they are the same. 3

Guidelines for Verifying Trig Identities 4

Example 1  Verify the identity. 5

Example 2  Verify the identity. 6

Example 3  Verify the identity. 7

Example 4  Verify the identity. 8

Example 5  Verify the identity. 9

Example 6  Verify the identity. 10

Example 7  Verify the identity. 11

Example 8  Verify the identity. 12

Homework 5.2  Worksheet