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Support Material: Using Sum and Difference Formulas (Trigonometry)
Go to: http://www.winpossible.com/.../Trigonometry_Using_the_Sum_and_Difference_Formulas.html (opens a new window)
Description: This mini-lesson explains more details of how to find the values of the sine and the cosine functions using the sum and difference formulas.
Technology Type: Flash 
Author: Winpossible
Language: English 
Cost: Does not require payment for use

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Courses: Trigonometry Sum and Difference