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This book is available for download with iBooks on your Mac or iOS device. Multi-touch books can be read with iBooks on your Mac or iOS device. Books with interactive features may work best on an iOS device. iBooks on your Mac requires OS X 10.9 or later.


Learn trigonometry the fun way, with over 70 dynamic video lessons and 30 hands-on interactives that let you explore the subject. Written by an award-winning Harvard educator, Trigonometry takes you step by step through every concept, from angles and triangles to vectors and complex numbers. Most importantly, you'll learn how trigonometry can be useful to you. So sit back, relax, and get schooled!

In this book, you'll learn all about:
1) Angles and right triangles
2) Sine, cosine, tangent, and other trig functions
3) Inverse trig functions
4) Different ways to find the area of a triangle
5) Law of sines and law of cosines
6) Trig identities
7) How to graph trig functions
8) Vectors
9) Complex numbers
10) Fractals
11) Applications of all these topics

Note: In order to properly view this book's media, please wait for the book to fully download. If you have any difficulties, let us know at or visit

What's New in Version 1.4

Fixed bug where tutorials and interactives had a black background on OS X Mavericks


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Customer Reviews

Tons of content!

This book is big because of all of the videos and interactives. It took a while to download but it's worth it! It shows up in the
Iibrary when you buy it but iBooks doesn't let you open it until it finishes downloading. The hands on demos are really cool and no other book has stuff like this.

Exceptional and Relevant Mathematics

After reviewing most of this e-text, I can definitely say unconditionally that this, by far, the most well designed trigonometry book on the market; $4.99 is a steal. Each concept, formula, or property is explained with interactive forms or proved with detailed video proofs. Another very powerful component to this book is the "why is this important" section. Giving specific example of where and how the math is used makes it meaningful. Great job guys...I am anxiously awaiting your calculus ebook.

effective text for middle schooler

I was intrigued by this book and the low price encouraged me to try it out. I already know trig, so I gave it to my middle school aged child for some late summer amusement before school starts. He took algebra at school last year, and was at a good point in his math education to start on this text. We both like the mix of written text, interactive features and animated lectures, and all of the parts I have looked at are accurate, rigorous and presented in a clear and logical way. He has now completed the first 8 chapters, and has gained a good conceptual grasp of the topics covered. The exercises are good, although there are fewer than in a traditional text. We felt this was a good feature, as it allowed him to learn a lot in a short period of time. Nonetheless, we would welcome a companion "workbook" for building fluency. Now that he is nearing the end of the book, he is eager for the publication of the next School Yourself volume, Calculus.

View in iTunes
  • Free
  • Level: Grades 6-17
  • Available on iPad, iPhone and Mac.
  • Category: Mathematics
  • Published: Apr 12, 2012
  • Publisher: School Yourself
  • Seller: School Yourself, LLC
  • Print Length: 177 Pages
  • Language: English
  • Version: 1.4
  • Requirements: To view this book, you must have an iPad with iBooks 2 or later and iOS 5 or later, or an iPhone with iOS 8.4 or later, or a Mac with OS X 10.9 or later.

Customer Ratings