Download Full Text (5.3 MB)

Download Note to Students (65 KB)

Download Preface (74 KB)

Download The Trigonometric Functions (777 KB)

Download Graphs of the Trigonometric Functions (1.2 MB)

Download Triangles and Vectors (766 KB)

Download Trigonometric Identities and Equations (556 KB)

Download Complex Numbers and Polar Coordinates (443 KB)

Download Appendix A: Answers for the Progress Checks (676 KB)

Download Appendix B: Answers and Hints for Selected Exercises (240 KB)

Download Appendix C: Some Geometric Facts about Triangles and Parallelograms (76 KB)

Download Index (47 KB)


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.

Publication Date



Grand Valley State University



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This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.




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