New!

Trigonometry: A Right Triangle Approach, 2nd Edition

Ron Larson

Copyright 2027
{{checkPublicationMessage('Published', '2026-08-17T00:00:00+0000')}}

Starting At $87.95 See pricing and ISBN options

Instructor Next Steps

Students: Buy now

Trigonometry: A Right Triangle Approach 2nd Edition by Ron Larson

Quick Navigation

Overview
Meet the Author
What's New
Table of Contents
Pricing

Overview

Larson's "Trigonometry: A Right Triangle Approach," 2e offers a focused, student-friendly approach that begins with right triangles and builds toward broader trigonometric relationships and applications. Continual review and real-life applications reinforce learning throughout the course. WebAssign brings together the proven Larson approach with varied question types, targeted practice and grading that recognizes algebraically equivalent answers, giving instructors flexibility to support students where needed. New brief lecture videos and Getting Ready for the Chapter sections add more ways to address readiness and keep students moving forward.

Meet the Authors

{{collapseContainerClosed['meet-the-author'] ? 'Show More' : 'Show Less'}}

Ron Larson

Dr. Ron Larson is a professor of mathematics at the Pennsylvania State University, where he has taught since 1970. He is considered the pioneer of using multimedia to enhance the learning of mathematics, having authored more than 30 software titles since 1990. Dr. Larson has also authored numerous acclaimed textbooks, including the best-selling calculus series coauthored with Dr. Bruce Edwards and published by Cengage. Dr. Larson received the 2017 William Holmes McGuffey Longevity Award for PRECALCULUS and for CALCULUS. He also received the 2018 Text and Academic Authors Association TEXTY Award for CALCULUS: EARLY TRANSCENDENTAL FUNCTIONS. In addition, Dr. Larson received the 1996 Text and Academic Authors Association TEXTY Award for INTERACTIVE CALCULUS -- a complete text on CD-ROM that was the first mainstream college textbook to be offered on the internet.

What's New

{{collapseContainerClosed['whats-new'] ? 'Show More' : 'Show Less'}}

New brief lecture videos provide concise presentations of key concepts, giving students another way to get support when they need it.
New Mastery Sets provide focused practice that helps students reinforce key skills and demonstrate what they have learned.
New Getting Ready for the Chapter sections emphasize the Big Idea concepts and prerequisite skills students need before beginning new material.
Fully updated Larson Corequisite Support through Precalculus gives instructors a more consistent way to address readiness with prerequisite practice alongside course-level work.
Expanded Problems guide students through intermediate steps, providing structured practice with multi-step problem solving rather than focusing only on the final answer.
Review & Refresh exercises revisit prerequisite skills throughout the course, while WebAssign's free College Math Readiness Bootcamp gives students an additional way to identify and strengthen gaps before they interfere with new learning.
How Do You See It? exercises use real-life problems and visual reasoning to help students apply course concepts in different contexts.

{{collapseContainerClosed['table-of-contents'] ? 'Show More' : 'Show Less'}}

1. RIGHT TRIANGLE TRIGONOMETRY.
Angles, Degree Measure, and Special Triangles. Similar Triangles. Trigonometric Functions: Right Triangle Ratios. Solving Right Triangles. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
2. TRIGONOMETRIC FUNCTIONS.
Trigonometric Functions of Any Angle. Radian Measure. The Unit Circle and Trigonometric Functions. Basic Trigonometric Identities. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
3. GRAPHS OF TRIGONOMETRIC FUNCTIONS.
Graphs of Sine and Cosine Functions. Transformations of the Graphs of Sine and Cosine Functions. Graphs of Other Trigonometric Functions. Inverse Trigonometric Functions. Solving Trigonometric Equations Algebraically and Graphically. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
4. ANALYTIC TRIGONOMETRY.
Using Fundamental Identities. Verifying Trigonometric Identities. Sum and Difference Formulas. Multiple-Angle Formulas. Product-to-Sum and Sum-to-Product Formulas. Solving Trigonometric Equations Using Identities and Formulas. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
5. ADDITIONAL TOPICS IN TRIGONOMETRY.
Law of Sines. Law of Cosines. Vectors in the Plane. Vectors and Dot Products. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
6. COMPLEX NUMBERS, PARAMETRIC EQUATIONS, AND POLAR EQUATIONS.
Complex Numbers. Trigonometric Form of a Complex Number. DeMoivre's Theorem. Parametric Equations. Polar Coordinates. Graphs of Polar Equations. Chapter Summary. Review Exercises. Chapter Test. Proofs in Mathematics. P.S. Problem Solving.
APPENDIX A: ALGEBRA REVIEW.
Review of Real Numbers and Their Properties. Solving Equations. The Cartesian Plane and Graphs of Equations. Linear Equations in Two Variables. Functions. Analyzing Graphs of Functions. A Library of Parent Functions. Transformations of Functions. Combinations of Functions: Composite Functions. Inverse Functions.
APPENDIX B: CONCEPTS IN STATISTICS (ONLINE).
Representing Data. Analyzing Data. Modeling Data.