# Verifying Trigonometric Identities

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Verifying Trigonometric Identities
Digital Lesson Verifying Trigonometric Identities

Guidelines for Verifying Identities
1. Start with the most complicated side of the equation. 2. Factor an expression, add fractions, square a binomial, or create s monomial denominator, if possible. 3. Use the fundamental identities, whenever possible. 4. Convert all terms to sines and cosines. 5. Always try something. Copyright © by Houghton Mifflin Company, Inc. All rights reserved. Guidelines for Verifying Identities

Example: Verify Identity

Graphing Utility: Verify Identity
Verify the identity Identical Values Table: Identical Graphs –2 2 –0.5 1.5 –2 2 –0.5 1.5 Graph: Copyright © by Houghton Mifflin Company, Inc. All rights reserved. Graphing Utility: Verify Identity

Example: Verify Identity

Sum and Difference Formulas

Sum and Difference Formulas (continued)
Signs are opposite Signs are the same Signs are the same Opposite signs Copyright © by Houghton Mifflin Company, Inc. All rights reserved. Sum and Difference Formulas (continued)

Double-Angle Formulas

Double-Angle Formulas (continued)