Analytical Geometry in Space . Differential calculus of functions of several variables. Differential Equations is a unique publication that combines three key sections of mathematical analysis and geometry, giving the reader the opportunity to understand more deeply complex concepts and their practical application. This work is the result of the collaborative work of experienced authors who seek to make complex topics accessible and understandable to a wide audience. The first part of the book deals with analytic geometry in space. Here, the reader will be able to immerse himself in the study of the properties of figures in three-dimensional space, learn methods for describing lines and planes, and also learn how to solve problems related to finding distances and angles between geometric objects. The authors use illustrative examples and graphic illustrations, which makes the learning process more exciting and effective. This part of the book will be especially useful for students of technical specialties, as well as for those who are preparing for exams in mathematics and physics. The second part is devoted to differential calculus of functions of several variables. Here the reader will get acquainted with the basics of multidimensional analysis, such as partial derivatives, gradients, and extremums of functions. The authors focus on the practical application of these concepts, citing examples from physics and engineering, which allows the reader to see how theoretical knowledge is transformed into real solutions. This part of the book will be interesting not only for students, but also for practicing engineers, economists and everyone who uses mathematics in their professional activities. The third part of the book covers the topic of differential equations, which play a key role in modeling various processes in nature and technology. The reader will learn about the methods of solving both ordinary and partial differential equations, as well as the application of these methods in various fields of science. The authors present complex concepts in an accessible form, making this part of the book particularly valuable for undergraduates, graduate students, and researchers. Analytical Geometry in Space . Differential calculus of functions of several variables. Differential Equations” will be of interest to a wide range of readers: from high school students preparing for admission to students and graduate students, as well as teachers who are looking for quality materials for their classes. It will become an indispensable assistant for anyone who wants to deepen their knowledge in mathematics and learn how to apply them in practice. The style of the authors is distinguished by clarity and logical presentation, which makes it easy to digest even the most complex topics. The book is filled with illustrations, examples and tasks, which makes the learning process more interactive and exciting. The authors strive not only to convey knowledge, but also to inspire the reader to further study mathematics. If you are looking for a quality guide to analytic geometry, differential calculus, and differential equations, this edition will be an excellent choice. It will not only expand your knowledge, but also help you confidently apply them in your studies and professional activities. Do not miss the opportunity to immerse yourself in the fascinating world of mathematics with a book that will make this process accessible and interesting!