- Trigonometry (online textbook) Free, online textbook, by Katherine Yoshiwara, of Los Angeles Pierce College.
- Algebra and Trigonometry A free, online textbook from OpenStax.
- Trigonometry (online textbook) Free, online textbook, from Grand Valley State U. and Open Textbooks.
- Precalculus A free, online textbook from OpenStax.
- Business Precalculus Free, online textbook, by a Pierce College (WA) instructor.
- Precalculus "These are notes for a course in precalculus, as it is taught at New York City College of Technology - CUNY([City U of NY]) . . . This course in precalculus has the overarching theme of 'functions.' "
- Precalculus: An Investigation of Functions (2nd Ed) "Precalculus: An Investigation of Functions is a free, open textbook covering a two-quarter pre-calculus sequence including trigonometry. The first portion of the book is an investigation of functions, exploring the graphical behavior of, interpretation of, and solutions to problems involving linear, polynomial, rational, exponential, and logarithmic functions. An emphasis is placed on modeling and interpretation, as well as the important characteristics needed in calculus." By Matthew M. Conroy, University of Washington.
- Pre-Calculus Free, online textbook, from Big Bend Community College, in Moses Lake, WA.
- Trigonometry (Open Textbook Library) By Richard W. Beveridge

- Finite Math/Business Precalculus Free, online course materials from David Lippman of Pierce College (WA) and Lumen Learning.
- MyOpenMath.com "MyOpenMath is an online course management and assessment system for mathematics and other quantitative fields. MyOpenMath’s focus is providing rich algorithmically generated assessment to support the use of free, open textbooks like the ones listed on OpenTextBookStore.com." Registration (free) is required.
- Precalculus - Lumen Learning "This course covers topics including linear, polynomial, rational, exponential, logarithmic, periodic, and trigonometric functions, along with equations, identities, conic sections, sequences, the binomial theorem, limits, and basic concepts of calculus. The revised and modified course includes complete text, practice problems, videos, problem sets, practice exams, and online assessments."
- Trigonometry (Click on "MATH 142 - Trigonometry") Videos and online textbook, from Big Bend Community College.
- PreCalculus (Click on "MATH 141-Pre-Calculus") Click on "MATH 141-Pre-Calculus." "This course will present the following concepts: non-linear inequalities, matrices and determinants, polynomial and rational functions, conic sections, theory of equations, sequences and series, mathematical induction." From Big Bend Community College.

- Trigonometry Demystified by Stan Gibilisco "This book covers every key aspect of trigonometry: how angles are measured; the relationship between angles and distances; coordinate systems; calculating distance based on parallax; reading maps and charts; latitude and longitude; and much more."Call Number: EbookISBN: 1280301856Publication Date: 2003
- Schaum's Outline of Precalculus by Fred SafierCall Number: EbookISBN: 1281784877Publication Date: 2009
- Pre-Calculus Demystified by Rhonda Huettenmueller Covers "absolute value, nonlinear inequalities, functions and their graphs, inverses, proportion and ratio, and much more."Call Number: EbookISBN: 0071469567Publication Date: 2012
- Homework Helpers: Pre-Calculus by Denise SzecseiCall Number: EbookISBN: 1601638450Publication Date: 2007
- Math for Real Life: Teaching Practical Uses for Algebra, Geometry and Trigonometry by Jim LibbyCall Number: EbookISBN: 1476626758Publication Date: 2017-01-05

- Average Rate of Change: Calculus—Derivatives: Tangent and Normal Lines "The average rate of change of a function over an interval is the average slope of the function over the same interval.." 6-minute video.
- MyOpenMath.com "MyOpenMath is an online course management and assessment system for mathematics and other quantitative fields. MyOpenMath’s focus is providing rich algorithmically generated assessment to support the use of free, open textbooks like the ones listed on OpenTextBookStore.com." Registration (free) is required.
- Khan Academy: Precalculus Lessons, including streaming videos, from Khan Academy.
- Khan Academy: Trigonometry Lessons, including streaming videos, from Khan Academy.
- Trigonometry (Click on "MATH 142 - Trigonometry") Videos and online textbook, from Big Bend Community College.
- PreCalculus (Click on "MATH 141-Pre-Calculus") Click on "MATH 141-Pre-Calculus." "This course will present the following concepts: non-linear inequalities, matrices and determinants, polynomial and rational functions, conic sections, theory of equations, sequences and series, mathematical induction." From Big Bend Community College.
- How To Learn Trigonometry IntuitivelyWith video, diagrams, and text.

- How To Learn Trigonometry IntuitivelyWith video, diagrams, and text.

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