books.google.com - This best selling author team explains concepts simply and clearly, without glossing over difficult points. Problem solving and mathematical modeling are introduced early and reinforced throughout, providing students with a solid foundation in the principles of mathematical thinking. Comprehensive and...http://books.google.com/books/about/Precalculus_Mathematics_for_Calculus.html?id=wt9Y0tdprfEC&q=angle&utm_source=gb-gplus-sharePrecalculus: Mathematics for Calculus