Here are some sample chapters:
Table of Contents
Chapter 2 - Precalculus 2
Chapter 12 - Substitution, Areas
The problem with textbooks in Kindle is that, they are written for the printed page and do not look good on screen. You have to zoom in and out non-stop, which makes it impossible to concentrate.
This book is written specifically with Kindle in mind, so you do not need to zoom.
Here is what I mean in pictures: