Precalculus with Unit-Circle Trigonometry, Third Edition, by David Cohen continues to create a book that is accessible to the student through a careful progression and presentation of concepts, rich problem sets and examples to help explain and motivate concepts, and continual guidance through the challenging work needed to master concepts and skills. This book is identical to Precalculus: A Problems-Oriented Approach, Fifth Edition with the exception of the first four chapters on trigonometry.