- 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.
S.O.S. Math - Trigonometry
Covers measuring degrees, equations, and formulas. Includes illustrations and related links.
An Introduction to Trigonometry
Definitions, basics, functions, and other concepts necessary to understand basic trigonometry.
Dave's Short Trig course
Covers basic definitions and concepts in beginning trigonometry.
A brief overview of trigonometric terms and concepts.