Defining Trigonometric Ratios

Defining trigonometric ratios from the unit circle. See also: [b]Unit Circle and Sine Graph: [/b]http://www.geogebratube.org/material/show/id/8028 [b]Unit Circle and Cosine Graph: [/b] http://www.geogebratube.org/material/show/id/8029 [b]Unit Circle and Tangent Graph: [/b]http://www.geogebratube.org/material/show/id/8030 Anthony Or. GeoGebra Institute of Hong Kong. E-mail: orchiming@gmail.com 
 
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