| Activities in Math: Trigonometry: Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises. |
| Addition Formulas for Sines and Cosines: Describes how the Sine and Cosine Addition Formulas can be derived by using vectors and how these formulas can be remembered relatively easily. |
| An Index of Trigonometry Help Pages: Provides detailed discussion of trigonometry concepts. Includes examples of varying difficulty. |
| An Introduction to Trigonometry: Definitions, basics, functions, and other concepts necessary to understand basic trigonometry. |
| Basic Trigonometry: Cosine, sine and tangent are defined. The Pythagorean theorem is illustrated as well the number of degrees in a many sided figure. |
| Dave's Short Trig course: Covers basic definitions and concepts in beginning trigonometry. |
| Four Branches of Trigonometry: Includes information on the laws of sines and cosines, right triangle trigonometry, and the ambiguous case. |
| Marlene's Trigonometry Calculator: Learn the basics, the solutions, and how to convert from degrees to radians. |
| S.O.S. Math - Trigonometry: Covers measuring degrees, equations, and formulas. Includes illustrations and related links. |
| Sine and Other Trigonometric Functions: Interactive tests and exercises. |
| Trigonometry: Introduction to trigonometry. Includes links to trig-based animations and definitions. |
Classical
