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The Mathematics of the Heavens and the Earth: The Early History of Trigonometry By: Glen Van Brummelen Read more
A Graphical Approach to Algebra and Trigonometry 6th edition By: Margaret L Lial, John Hornsby, Gary K Rockswold Read more
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Precalculus: Concepts Through Functions, a Unit Circle Approach to Trigonometry, 4th edition By: Michael Sullivan Read more