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Trig According to Euclid

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Visit this site: http://www.math.uaa.alaska.edu/~smiley/trigproofs.html
Author:Len Smiley, Deborah Smiley
Description: Four figures proving trigonometric addition and subtraction formulas for cosine and sine. Free of Cartesian coordinates, the proofs are synthetic and use a common, minimal diagram from Euclidean geometry.
Levels: High School (9-12), College
Languages: English
Resource Types: Graphics
Math Topics: Trigonometry

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