Open Trigonometry: Basic to Advanced
Publisher: Wikibooks 2014
Number of pages: 51
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. This is by design. Many students find the video presentation helpful with learning mathematical material.
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by Steven Sy - Michigan State University
From the table of contents: Review of Functions; Rational Functions; Elementary Trigonometry; Graphing Trigonometric Functions; Trigonometric Identities; Advanced Trigonometric Concepts; Triangle Trigonometry; Selected Answers to the Exercises.
by W. E. Paterson - Clarendon Press
In this book the trigonometrical ratios are introduced as functions of the angle. The trigonometrical properties of the single angle are treated fully in the early chapters, and the examples apply Trigonometry wherever it may be useful.
by David E. Joyce - Clark University
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. You should already be familiar with algebra and geometry.
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.