A collection of math books.

This book introduces the subject of trigonometry using the degree angle system and the geometry of the right-triangle. It contains basic trigonometry terminology, functions and identities.

This web-book covers the fundamentals of trigonometry using the radian angle system and the geometry of the circle. The definitions of the trigonometric functions are extended using the geometry of the circle. The applications of trigonometry are also discussed.

This web-book is a deep dive into trigonometry in the complex plane. Building upon the concepts in the previous book, the fundementals of trigonometry, this book explores the definition of trigonometric functions, Euler's formula and Fourier transformations.