1. 14.3 Verifying Identities

2. Example 4-1a Verify that is an identity. Answer: Transform the left side. Original equation Simplify. Example:

3. Example 4-1b Verify that is an identity. Answer: Another one:

4. Example 4-2a Multiple-Choice Test Item AB C 0 D Read the Test Item Find an expression that is equal to the given expression. Example:

5. Example 4-2b Solve the Test Item Write a trigonometric identity by using the basic trigonometric identities and the definitions of trigonometric functions to transform the given expression to match one of the choices. Rewrite using the LCD,

6. Example 4-2c Subtract. Simplify. Answer: Sincethe answer is A.

7. Example 4-2e Multiple-Choice Test Item AB C 0 D Answer: B Another one:

8. Example 4-3a Verify thatis an identity. Answer: Original equation Express all terms using sine and cosine. Example: Rewrite using the LCD, Simplify the right side.

9. Example 4-3c Verify thatis an identity. Answer: Another one:

10. Example 4-3d