Trigonometry Series - Concepts and Formulas™
Trigonometric Functions and Applications (TRG-CF2)

This sheet provides a comprehensive review of all of the most important topics, concepts and formulas covering trigonometric functions and applications. Each concept is explained in detail, with detailed illustrations. Unlike charts and notes, this Concepts and Formulas™ sheet answers questions about how to use the concepts - how to actually solve problems with them, it doesn't just list facts and formulas. There is even an example, or two, for each concept, to help you to nail down the central ideas.

Topics Covered:

• Two special isosceles right triangles
• Angles and coordinates of the unit circle
• Trigonometric functions
• Reference angles and Reference numbers
• Reciprocal trigonometric functions
• The Pythagorean identities
• The definitions of the six basic trigonometric functions and their Pythagorean relationships
• How to determine the sign of a trigonometric function
• Angles of inclination and depression
• Areas of triangles