The book "A Certain Integral: Study. -method. E. E. Dolgopolova and Yu. In. Savina is not just a textbook, but a real find for students, teachers and anyone who seeks to understand the basics of mathematical analysis more deeply. In this work, the authors offer readers a unique look at the concept of a certain integral, which is one of the key topics in the course of higher mathematics. In the first part of the book, readers are immersed in the theoretical aspects of a certain integral. The authors explain carefully and easily what an integral is, how it relates to the concept of an area under a curve, and why it is so important in various fields of science and technology. In this guide you will find not only formulas and theorems, but also many examples that will help to fix the material. Each chapter ends with practical tasks, which makes the study interactive and exciting. The book will be especially useful for students of mathematical, engineering and physical specialties, as well as for anyone who is interested in mathematics and wants to deepen their knowledge. If you are preparing for exams or just want to refresh your skills, this guide will become your reliable companion. It is suitable both for self-study and for use in classes at the university .. The topics raised in the book cover not only theoretical aspects, but also the practical application of a certain integral. The authors discuss its use in various fields such as physics, economics, and engineering, making the material particularly relevant. Readers will be able to see how mathematical concepts are applied in real life, which adds additional value to learning. The writing style of Dolgopolov and Savin is clear and accessible. They are able to explain complex things in simple language, which makes their manual ideal for a wide audience. Both authors have a wealth of experience in teaching and writing instructional materials, and this is reflected in the quality of their work. Their previous editions have also received positive reviews and have become popular among students and faculty. If you are looking for books on mathematics that will help you understand complex topics, pay attention to such works as "Mathematical Analysis" or "