Един начин за преговор на формулите по тригонометрия в средното училище

Kliment Vasilev - The trigonometry formulas are given in the form of mathematical problems. Some of these problems are solved, and it is shown how the others can be solved with the help of adequate guidance that includes the previous problems. This method is suitable for revision in the secondary school, as well as for preparation for school-leaving exams and matriculation.

The Deformed Trigonometric Functions of two Variables

MSC 2010: 33B10, 33E20