This series covers essential subjects in Trigonometry and Pre-Calculus with exceptional clarity so that students will feel well prepared to move onto Calculus and Physics. What sets this series apart from other Trigonometry teaching tools is that the concepts are taught entirely through step-by-step example problems of increasing difficulty. It works by introducing each new concept in an easy to understand way and using example problems that are worked out step-by-step and line-by-line to completion. In this program, the difference between an imaginary and a complex number is introduced along with examples that allow students to practice simplifying expressions with imaginary and complex numbers. Many problems are worked through in step-by-step detail to reinforce the principles. Teachers User Instruction & Resource Guide - Includes Recommended books & Trigonometry Websites.