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Activity: Sums of Sinusoidal Functions
Go to: http://www.keypress.com/.../SineSums.zip (opens a new window)
Description:

Students model wave superposition and wave packets, analyzing sums of sinusoidal waves. The link to the tool itself is to a zip file that contains both the activity in pdf format and the corresponding sketch.

This is a free sample activity from Exploring Precalculus with the Geometer's Sketchpad.

Technology Type: Sketchpad 
Authors: Key Curriculum Press/Daniel Scher
Scott Steketee
Paul Kunkel
Irina Lyublinskaya
Language: English 
Cost: Does not require payment for use

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Activity: Exploring Precalculus with The Geometer's Sketchpad
Tool: Sums of Sinusoidal Functions
Courses: Trigonometry Transforming Graphs