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Tool: Graphs of Sine, Cosine, and Tangent
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Description: Move a point around the unit circle to generate the graph of sine, cosine, or tangent. The appropriate measurement is displayed in the circle and translated onto the function graph. (After going to the URL, click on red box labeled 'The graphs of sin, cos and tan' to launch applet.)
Technology Type: Java Applet 
Authors: Franz Embacher and Petra Oberhuemer
maths online
Language: English 
Cost: Does not require payment for use

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Courses: Trigonometry sin, cos and tan, Graphs of Functions

Comment:Nice visual of unit circle values as related to graphs, though it would be better if you could animate the unit circle point rather than having to drag it manually.