This iBook contains concepts taught in pre-calculus with easier explanations, pictures, videos, and interactivity. Unlike the boring and dull hardcover textbooks, this ebook has an aesthetically pleasing look and is easier to understand. Each chapter is unique; some have example problems while others may have video tutorials. Concepts that are taught in this iBook include: Unit Circle, Basic Trigonometric Functions, Graphs, Pythagorean Identities, Sum/Difference Double Angle Identities, and Law of Sines.