Trigonometry: trigonometric functions. Transformations of trigonometric expressions

The attention of readers is offered a classic tutorial on trigonometry, written by famous Soviet mathematicians. Arbitrary angles and their trigonometric functions, transformations of trigonometric expressions, trigonometric functions of the numerical argument, trigonometric functions and trigonometric equations, elements of the theory of the triangle and the solution of the triangles are considered. At the end of each, chapters are given tasks and examples, the answers to which are contained at the end of the book. The book is recommended for students of higher educational institutions of the physical and mathematical profile, teachers and scientists, secondary school teachers and high school students.