Roland Ron Edwin Larson Roland Ron Edwin Larson site_link Larson s market leading text PRECALCULUS is known for delivering sound consistently structured explanations and exercises of mathematical concepts to expertly prepare students for the study of calculus With the ninth edition the author continues to revolutionize the way students learn material by incorporating real world applications ongoing review and innovative technology How Do You See It exercises give students practice applying the concepts and new Summarize features Checkpoint problems and a Companion Website reinforce understanding of the skill sets to help students better prepare for tests. Important Media content referenced within the product description or the product text may not be available in the ebook version PrecalculusIt s a textbook The online version that I used was included with videos and electronic examples for problems which was useful Each chapter had a summary with pertinant information in a easy to reference location English .