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Proof without Words: The Difference-Product Identities

by Sidney H. Kung (Jacksonville University)

This article originally appeared in:
Mathematics Magazine
October, 1996

Subject classification(s): Geometry and Topology | Trigonometry | Trigonometric Equations
Applicable Course(s): 2.2 Trigonometry | 2.3 College Algebra & Trigonometry combined

Trigonometric identities for \(\sin \alpha - \sin \beta\) and \(\cos \alpha - \cos \beta\) are proved.


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