Learn.
The world's first fully immersive textbook is here. Learn trigonometry the fun way with comprehensive video lessons and interactive demos of all the concepts. We'll also teach you why it's important.
Watch.
Skip ahead through lessons when you know it all, and rewind when you miss something. It's like having your own personal teacher guiding you through the course.
60° +
60° +
60°
= 180°
Play.
Solidify your understanding with hands-on interactive sandboxes, like the one shown here. Drag the triangle around to get started.
In the Textbook section of the iBookstore