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Textbooks
Trigonometry
Katherine Yoshiwara
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College Trigonometry
Carl Stitz, Jeff Zeager
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Algebra and Trigonometry
Open Stax
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Trigonometry
Ted Sundstrom, Steven Schlicker
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College Algebra & Trigonometry
Richard W. Beveridge
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Videos
Trigonometry
Khan Academy
Precalculus: College Algebra & Trigonometry
Professor Leonard