The content of the book corresponds to the new mathematics program for secondary specialized educational institutions based on 10 classes of secondary school, approved in 1978. The material is presented in a form accessible to a high school graduate, with the involvement of geometric and physical interpretations, in compliance with due mathematical rigor. The book contains a large number of solved examples and tasks, which contributes to a better understanding and assimilation of the educational material. There are self-help exercises at the end of each chapter.