This book is in fact, the last third of the book, Algebra Examples Trigonometry. So this book is about trigonometry, of course, and is for any student who wants to study it seriously. And in particular, it covers the area in depth and extent so that it can be good for those students, too, who want to study calculus later or now in university level, and want to be science or engineering majors. And some sample pages are at: http://www.runmath.com/ExcerptFromTrigSeongKim.pdf