Step operation: 1) educational programs GSP. Trigonometric functions basically the property of acoustic guitar chords, a circle. And other information related to 2) put all the information compiled by the selection of important and necessary analysis 3) create an equation to model the overlap of sound waves from the program GSP. Then the graph in the program Geometer's Sketchpad (GSP) Version 5.0 4) compares the sound of an equation to model the overlap of acoustic sounds of guitar chords,
the results showed that the analysis of trigonometric functions can be. the equation is as follows:
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