Dave's Short Course in Trigonometry
by David E. Joyce
Publisher: Clark University 2002
This website is a short introduction to Trigonometry by a professor at Clark University. It is very easy to follow, is full of animations and study problems for the reader to work through. These notes are more of an introduction and guide than a full course. You should already be familiar with algebra and geometry before learning trigonometry. From algebra, you should be comfortable with manipulating algebraic expressions and solving equations. From geometry, you should know about similar triangles, the Pythagorean theorem, and a few other things, but not a great deal.
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Book 1 is pre-calculus trigonometry. We assume the student is relatively new to algebra and do algebra step by step. Many of the pages have closely related free/YouTube videos at the Khan Academy. Many students find the video presentation helpful.
by Marcel B. Finan - Arkansas Tech University
The text represents a serious effort to produce exposition that is accessible to a student at the freshmen or high school levels. The chapters of this book are well suited for a one semester course in College Trigonometry.
by Carl Stitz, Jeff Zeager - Stitz Zeager Open Source Mathematics
Dr. Stitz and Dr. Zeager co-wrote this high-quality textbook that is within reach and accessible to the average college student. A quick glance at the table of contents shows that all the major topics of a college trigonometry course are included.
by Michael Corral - mecmath.net
A text on elementary trigonometry. Though designed for college students, it could also be used in high schools. The traditional topics are covered, but a more geometrical approach is taken than usual. Also, some numerical methods are discussed.