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Proof without Words: Geometry of Subtraction Formulas

by Leonard M. Smiley (University of Alaska)

This article originally appeared in:
Mathematics Magazine
October, 1999

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

A geometric fact is proved visually.


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