A directory of useful objects found on the web for teaching Maths.
https://web.archive.org/web/20150426112739/http://www.touchmathematics.org/topics/trigonometry
Interactive
An interactive visualization of the six basic trigonometric functions: sine, cosine, tangent, cosecant, secant, cotangent.
[The original version of this site is no longer available, this link it to the Internet Archive.]
7 August 2011 Edit: 3 March 2019
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