Precalculus: Concepts Through Functions, A Right Triangle Approach to Trigonometry, 4th Edition, provides a unique and effective way to teach trigonometry by connecting it to the real world. The book uses a right triangle approach to trigonometry, which makes it easier for students to understand the concepts. The book also includes a variety of real-world examples and applications, which helps students to see how trigonometry is used in the real world. The book is written in a clear and concise style, which makes it easy for students to understand.* The book is also accompanied by a variety of online resources, which can help students to learn and practice the concepts.