# High School Trigonometry/Trigonometric Identities

Trigonometric Identities

- Fundamental Identities
- Verifying Identities
- Sum and Difference Identities for Cosine
- Sum and Difference Identities for Sine and Tangent
- Double-Angle Identities
- Half-Angle Identities
- Product-and-Sum, Sum-and-Product, and Linear Combinations of Identities
- Trigonometric Identities Exercises

This material was adapted from the original CK-12 book that can be found here. This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License