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Proof without Words: The Cosine of a Difference

by Matthew Bode (Whatcom Community College) and Willam T. Webber (Whatcom Community College)

This article originally appeared in:
Mathematics Magazine
December, 2002

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

The authors present a visualization of the formula for the cosine of the difference of angles.


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Capsule Course Topic(s):
One-Variable Calculus | Background
One-Variable Calculus | Calculus Functions
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