There are nine focus areas of this course - 1) Relations and Functions, 2) Polynomial and Rational Functions, 3) Exponential and Logarithmic Functions, 4) Systems of equations, 5) Trigonometric Functions, 6) Analytic Trigonometry, 7) Applications of Trigonometry, 8) Conics and 9) Sequences and Series.

Precalculus with Trigonometry (MTH 167) was produced by the Virginia Community College System (VCCS) as an online Open Educational Resources (OER) course in partnership with three Community Colleges: J. Sargeant Reynolds, Tidewater, and John Tyler.

This trigonometry textbook is different than other trigonometry books in that it is free to download, and the reader is expected to do more than read the book and is expected to study the material in the book by working out examples rather than just reading about them. So this book is not just about mathematical content but is also about the process of learning and doing mathematics. That is, this book is designed not to be just casually read but rather to be engaged.

Since this can be a difficult task, there are several features of the book designed to assist students in this endeavor. In particular, most sections of the book start with a beginning activity that review prior mathematical work that is necessary for the new section or introduce new concepts and definitions that will be used later in that section. Each section also contains several progress checks that are short exercises or activities designed to help readers determine if they are understanding the material. In addition, the text contains links to several interactive Geogebra applets or worksheets. These applets are usually part of a beginning activity or a progress check and are intended to be used as part of the textbook.

The authors are very interested in constructive criticism of the textbook from the users of the book, especially students, who are using or have used the book. Please send any comments you have to trigtext@gmail.com.

Book description: This is a text on elementary trigonometry, designed for students who have completed courses in high-school algebra and geometry. 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 (e.g. the secant method for solving trigonometric equations) are discussed. A brief tutorial on using Gnuplot to graph trigonometric functions is included.

There are 495 exercises in the book, with answers and hints to selected exercises.

This text covers the content of a standard trigonometry course, beginning with a review of facts from geometry.