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Updated version include bonus questions and typos/errors fixed.
Below is the table of content. Get ready to have your mind blown.

Table of Content:
Lesson 1: The Six Trigonometric Functions 1
Lesson 2: Radian Angles 9
Lesson 3: The Unit Circle 18
Lesson 4: Trigonometric Graphs, Part One 26
Lesson 5: Trigonometric Graphs, Part Two 33
Lesson 6: Inverse Trigonometric Functions 40
Lesson 7: Trigonometric Identities 48
Lesson 8: Trigonometric Equations 56
Lesson 9: Sum and Difference Formulas 62
Lesson 10: Double-Angle Formulas and Beyond 69
Lesson 11: Product-to-Sum and Sum-to-Product 75
Lesson 12: Law of Sines 79
Lesson 13: Law of Cosines 86
Lesson 14: Areas of Triangles 92
Lesson 15: Polar Coordinates 97
Lesson 16: Graphing Polar Equations 104
Lesson 17: Complex Number in Polar Form 113
Lesson 18: Introduction to Vectors 120
Lesson 19: Dot Products 127
Lesson 20: Vectors in Three Dimension 134

Trigonometry - pocket, Engelsk, 2018