Who was the first person to use the unit circle? - Quora
Unit circle - Simple English Wikipedia, the free encyclopedia
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GC1VCQF Old M-78 Artesian Well (Earthcache) in Michigan, United States created by Merb
File:Unit circle used to define sine and cosine.svg - Wikipedia
File:Degree diagram.svg - Simple English Wikipedia, the free encyclopedia
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James Naismith invented the game of basketball, but had a losing record coaching it. He is the only University of Kansas head coach with a losing record. : r/Damnthatsinteresting
Unit Circle
3 Ways to Memorize the Unit Circle - wikiHow
File:Unit Circle Definitions of Six Trigonometric Functions.svg - Wikipedia
Unit circle - Wikipedia