Dave's Short Trig Course
Introduction to the basic concepts, including angle measurement, chords, and its applications.
aleph0.clarku.edu/~djoyce/java/trig
FAQ - Trigonometry
Interactive animations demonstrating how the sides and angles of a triangle are related to each other.
www.catcode.com/trig
History Topics: Trigonometric Functions
Describes how the functions were first discovered.
www-groups.dcs.st-andrews.ac.uk/~history/HistTopics/Trigonometric_functions...
Introduction To Trigonometry
Covers the trigonometric functions, as well as formulas, equations, and special values.
www.ping.be/~ping1339/gonio.htm
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