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

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 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 r...  