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Proof Without Words: The Triple-Angle Formulas for Sine and Cosine.

by Shingo Okuda

This article originally appeared in:
Mathematics Magazine
April, 2001

Subject classification(s): Calculus | Single Variable Calculus | Functions of Single Variable
Applicable Course(s): 2.2 Trigonometry | 3.1 Mainstream Calculus I | 3.4 Non-mainstream Calc I

A visualization of the triple angle formulas for sines and cosines is presented.


A pdf copy of the article can be viewed by clicking below. Since the copy is a faithful reproduction of the actual journal pages, the article may not begin at the top of the first page.

To open this file please click here.

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