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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