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The Double-Angle Formulas

A standard picture proof of the double angle formula for sine and cosine

Old Node ID: 
1317
Author(s): 
Roger B. Nelsen (Lewis and Clark College)
Publication Date: 
Wednesday, November 15, 2006
Original Publication Source: 
College Mathematics Journal
Original Publication Date: 
January, 1989
Subject(s): 
Geometry and Topology
Analytic Geometry
Circles
Trigonometry
Trigonometric Identities
Topic(s): 
Background
Flag for Digital Object Identifier: 
Publish Page: 
Furnished by JSTOR: 
Rating Count: 
69.00
Rating Sum: 
198.00
Rating Average: 
2.87
Author (old format): 
Roger B. Nelsen
Applicable Course(s): 
2.2 Trigonometry
3.0 Calculus
Modify Date: 
Wednesday, August 15, 2012
Average: 2.9 (69 votes)

Dummy View - NOT TO BE DELETED