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Technology 
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Sum and Difference Formulas (T...

Sum and Difference (Trigonometry) 
Flash 
Support Material 

[1]

This minilesson explains sum and difference formulas for sine and cosine functions.
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Using Sum and Difference Formu...

Sum and Difference (Trigonometry) 
Flash 
Support Material 

[0]

This minilesson explains more details of how to find the values of the sine and the cosine functions using the sum and difference formulas.
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Formula for sin(A+B)

Sum and Difference (Trigonometry) 
Java Applet 
Tool 

[0]

This applet teaches students geometrically that sin(A+B) = sin(A)cos(B) + cos(A)sin(B). Students can change the values of A and B.
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