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Reviews of the Text from the Open Textbook Library

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.

### ITEMS FROM the Textbook

### Supplements for the Textbook

A description for each of the following is given in the Resources section below.

### Resources for a Trigonometry Course

**Interactive Geogebra Applets**

The text contains links to several interactive Geogebra applets or worksheets. These are active links in the pdf version of the textbook, so clicking on the link will take you directly to the applet. Short URL’s for these links have been created so that they are easier to enter if you are using a printed copy of the textbook. Following is a link to the GVSU MTH 123 playlist of Geogebra applets on the Geogebra website. (MTH 123 is the trigonometry course at Grand Valley State University.)

These applets are usually part of a beginning activity or a progress check and are intended to be used as part of the textbook.

**Video Screencasts for Use with the Textbook**

Although not part of the textbook, there are several online videos (on YouTube) that can be used in conjunction with this textbook. Please keep in mind that these screencasts were produced when Grand Valley was using a different textbook. References to section numbers on the screencasts may not correspond to the section numbers of this textbook. See the link above for lists of screencasts for each section.There are two sources for these video screencasts.

The MTH 123 Playlist on Grand Valley’s Department of Mathematics YouTube Channel: (MTH 123 is the course number for the trigonometry course at Grand Valley State University.)

MTH 123 video screencasts on RocketMath 1. These video screencasts were created by Lynne Mannard, an affiliate faculty member in the Department of Mathematics at Grand Valley State University.

**Video Screencasts for Instruction in the Use of Geogebra**The last two times I taught Trigonometry, I had my students use Geogebra for their graphing utility so that they could include well-done, printed graphs in their assignments. Students seemed to be able to handle this quite well. I have produced a set of video screencasts to help students learn Geogebra. These screencasts are available on YouTube. These screencasts were produced using Geogebra Classic 5, which can be downloaded on the Geogebra website.

### Note to Instructors

Please contact me at trigtext@gmail.com for information about an instructor’s manual with solutions to the beginning activities and the exercises. In your email, please include the name of your institution (school, college, or university), the course for which you are considering using the text, and a link to a website that can be used to verify your position at your institution.