The book "Handbook on trigonometry" by Gnezdovsky Yu. and other authors - it is an indispensable assistant for students, schoolchildren and anyone who seeks a deeper understanding of the world of trigonometry This guide is not just a collection of formulas and tables, but a real find for those who want not only to remember, but also to realize how trigonometric functions and their applications work in various fields of science and technology. From the first pages, the reader is immersed in the fascinating world of trigonometry, where each formula and each definition becomes not just a set of symbols, but the key to understanding more complex mathematical concepts. The book covers all major aspects of trigonometry: from the definition of angles and functions to complex equations and graphs. The authors pay attention not only to theory, but also to practical tasks, which makes the material accessible and understandable to a wide audience. The “Trigonometry Handbook” will be of interest not only to students of mathematical and technical specialties, but also to high school students preparing for exams . If you want to prepare for the exam or OGE, or just deepen your knowledge of mathematics, this book will become your reliable companion. It will also be suitable for teachers who are looking for high-quality and affordable material for their lessons. The topics raised in the book cover a wide range: from the basics of trigonometry to its application in physics, engineering, and other sciences. The authors focus on the practical application of trigonometric functions in real-world problems, allowing readers to see how mathematics is used in everyday life. This makes the book especially valuable for those who want to relate their knowledge to real-world situations and understand how trigonometry helps solve practical problems. The style of the authors is clear and accessible. They are able to explain complex things in simple language, which makes the material easy to perceive. This quality is especially important for those who are just starting to get acquainted with trigonometry or have difficulty learning mathematics. Gnezdovsky Yu . and his colleagues use many illustrations and examples, which helps to better absorb the material and makes the learning process more exciting. If you are looking for similar books, pay attention to such works as "Trigonometry for Dummies" or "Mathematics. A complete guide" that can also help you in learning this important area. Searches such as “trigonometry for students”, “mathematics for schoolchildren” or “mathematics reference book” can lead you to other useful resources, but the “trigonometry reference book” of Gnezdovsky Yu. Its structure and depth. This book is noteworthy not only for its content, but also for its ability to inspire the study of mathematics. It shows that trigonometry is not just a set of formulas, but a whole world full of possibilities and discoveries. With the help of the Handbook of Trigonometry, you can not only prepare for exams, but also develop your analytical abilities, which will be useful in any area of life. In conclusion, the Handbook of Trigonometry is not just a textbook, but a real find for anyone who wants to understand trigonometry and use it in their studies and work. If you are ready to discover the world of angles, functions and graphs, this book will be your reliable guide.