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Tool: Cosine Engine
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Go to: http://www.ies-math.com/math/java/trig/cosengn/cosengn.html (opens a new window)
Description: With this applet, students study the extrema of the function A cos^2 (t) + B cos(t) + C. A parabola is drawn with student-supplied coefficients and constant, and the unit circle is drawn below, so that distance along the x-axis is equal to cos(t).
Technology Type: Java Applet 
Author: International Education Software (IES)
Language: English 
Cost: Does not require payment for use

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Courses: Trigonometry The Unit Circle
PreCalculus domain and range of functions, composite functions