This encyclopedia contains trigonometric identity proofs for some three hundred identities. The book is presented in the form of mathematical games for the reader’s enjoyment and includes a concordance of trigonometric identities, enabling easy reference.

Trig or Treat is a must-have for:

• every student of trigonometry, to find the proofs for trigonometric identities that may be set in class or in exams;
• every teacher of trigonometry, to have easy access to trigonometric identities of different levels of difficulty, to set assignments for different levels of students;
• every library, to provide a ready resource for students
• every aficionado of Sudoku, crossword puzzles, jigsaw puzzles, Tetris, and other games, who love an intellectual challenge.

Contents:

• The Basics of Trigonometry
• Pythagoras’ Theorem
• Compound Angles, Double Angles and Half Angles
• Angles in a Triangle
• Sum and Difference of sin and cos
• Practical Trig: Numerical Values of Special Angles — Graphs of sin, cos and tan for 0°–360°
• Appendices:
• The Concordance of Trigonometric Identities
• The Encyclopedia of Trigonometric Games or Trigonometric Identity Proofs (TIPs)