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Activities in Math: Trigonometry - Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises.
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.
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.
Trigonometry Angle Calculator - Visually calculate angles, lengths and circle dimensions.
Trogonometry I - Self-teaching site offered by Doug Simms. Watch instructional videos, then print exercise and answer sheets.