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Defining Sine and Cosine using the Unit Circle
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http://youtu.be/IU1KNS0OHwk Rate video Rate this resource
http://www.khanacademy.org/video/unit-circle-definition-of-trig-functions?playlist=Trigonometry Rate video Rate this resource

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Additional Resources (if any)

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Special Triangles (45-45-90 and 30-60-90) http://youtu.be/nVTtSE5nv7c Rate video Rate this resource
Special Triangles (45-45-90 and 30-60-90) http://www.khanacademy.org/video/45-45-90-triangles?playlist=Geometry Rate video Rate this resource
Special Triangles (45-45-90 and 30-60-90) http://www.khanacademy.org/video/30-60-90-triangles-ii?playlist=Geometry Rate video Rate this resource
Special Triangles (45-45-90 and 30-60-90) http://youtu.be/b6MsSkXYQo4 Rate video Rate this resource
Special Triangles (45-45-90 and 30-60-90) http://www.khanacademy.org/video/intro-to-30-60-90-triangles?playlist=Geometry Rate video Rate this resource