Introduction to Trigonometry (Zambak)

This book is an introduction to trigonometry and trigonometric applications for high school students. Before beginning this book, students should be familiar teith the basic properties of of angles, triangles and circles, and be able to manipulate and factorize algebraic expressions. The book is divided into five sections, structured as follows:
The first section covers the concepts of angle, arc and circle and their basic properties. It also introduces the degree and radian units of angle measure.
The second section is an introduction to right triangle trigonometry, and introduces key trigonometric identities which are used throughout the rest of the book.
The third section deals with trigonometry on the unit circle, and leads students to an understanding of the six main trigonometric functions and their properties.
The fourth section builds on the material of the previous sections and presents the ma in trigonometric theorems and formulas that students need to know at this level, with many examples of how they are used.
The fifth section concludes the book with a look at some applied trigonometry problems, bringing together the material that student have studied during the course.