I was looking for Precalculus ebooks/notes and I have found the following links. Most of these books are are licensed under Creative Commons and/or lecture notes so, I assume that they are safe to download.
As for 10, 11, and 12, the website containing the links may have obtained permission from the publisher to display it online, but I don’t think it is legal to download them.
Free Precalculus Ebooks
- Functions Modeling Change: A Precalculus Course by Marcel B. Finan
- PreCalculus by Carl Stitz and Jeff Zeager
- Precalculus by Collingwood, Prince, and Conroy
- Precalculus: An Investigation of Functions by David Lippman and Melonie Rasmussen
- Precalculus Notes from University of Notredame
- Precalculus Textbook from Rancocas Valley High School
- Precalculus An Honors Course by David Santos
- Precalculus by Thomas Tradler and Holly Carley
- Precalculus by Ken Kuniyuki
- Precalculus: Graphical, Numerical and Algebraic by Franklin Demana, Bert Waits, Gregory Foley and Daniel Kennedy
- Precalculus with Limits: A Graphing Approach by Ron Larson
- Precalculus: A Graphing Approach by Thomas Hungerford, Irene Jovel, and Betty Mayberry
- THS Advanced Precalculus
To see more free Ebooks and other freebies, please visit the All for Free page.