Dave's Short Trig course
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]  Covers basic definitions and concepts in beginning trigonometry. 

Activities in Math: Trigonometry
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]  Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises. 

An Index of Trigonometry Help Pages
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]  Provides detailed discussion of trigonometry concepts. Includes examples of varying difficulty. 

Basic Trigonometry
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]  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
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]  Covers measuring degrees, equations, and formulas. Includes illustrations and related links. 

Sine and Other Trigonometric Functions
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]  Interactive tests and exercises. 

Four Branches of Trigonometry
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]  Includes information on the laws of sines and cosines, right triangle trigonometry, and the ambiguous case. 

An Introduction to Trigonometry
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]  Definitions, basics, functions, and other concepts necessary to understand basic trigonometry. 

Addition Formulas for Sines and Cosines
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]  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
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]  Learn the basics, the solutions, and how to convert from degrees to radians. 

Trigonometry
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]  Introduction to trigonometry. Includes links to trigbased animations and definitions. 

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