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Proof Without Words: Double Sum for Sine and Cosine

The author proves visually the double angle formulas for sine and cosine.

MSC Codes: 
97G40
Author(s): 
Hasan Unal (Yildiz Technical University, Turkey)
Publication Date: 
Tuesday, April 9, 2013
Original Publication Source: 
College Mathematics Journal
Original Publication Date: 
November, 2010
Subject(s): 
Geometry and Topology
Geometric Proof
Topic(s): 
Development Math
Formulas
Flag for Digital Object Identifier: 
Publish Page: 
Furnished by JSTOR: 
File Content: 
Applicable Course(s): 
2.2 Trigonometry
Modify Date: 
Tuesday, April 9, 2013
Average: 2.7 (16 votes)

Dummy View - NOT TO BE DELETED