One of the best Precal Books
This book is one of the best out there in the current markets. Dr. Stewart explains this subject with geometrical shapes to better understand the subject. For example he explains and proves the the phytogorean theorem, laws of sines and cosines, and alot more. Highly recommend this book as well as his other ones like college algebra and calculus. He is an expert in this subjects. The best way to master a theorem in math is to prove and applied its existence and this book aims at teaching this principles.