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. The definition of sine, cosine, tangent, cotangent, secant, and cosecant are expressed in terms of the sides of a right triangle. The reciprocal relations between these functions are presented to students. These properties are used to solve several trigonometric problems in step-by-step detail. Teachers User Instruction & Resource Guide - Includes Recommended books & Trigonometry Websites.