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Proof without Words: Area and Difference Formulas

by Sidney H. Kung (Jacksonville University)

This article originally appeared in:
Mathematics Magazine
December, 1989

Subject classification(s): Geometry and Topology | Geometric Proof | Trigonometry
Applicable Course(s): 2.2 Trigonometry | 3.1 Mainstream Calculus I

The author presents a visualization of the formula for the sine and cosine of the difference of angles.


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