The collection of books on trigonometry is a good selection of books for a mathematics lover, student, applicant and student. These books are intended as textbooks for the physics and mathematics faculties of pedagogical institutes and universities in the section "Trigonometry" - a special course in elementary mathematics. When writing this book, I was guided by the same principles that form the basis of my book "Special Course in Elementary Algebra" and which I expressed in detail in the preface to the mentioned book. The collection consists of the following books.