Author: Djabbarov, Odil Djurayevich; Jonqobilov, Jahongir Tirkashevich

Annotation: In this article, the definition of trigonometric functions through lines, which is different from the geometric definition, is studied. Since different mathematical concepts have equivalent definitions, there are other definitions of trigonometric functions. It is shown that the properties of the geometric definition are superimposed on the properties of the definition through lines. In the same way, the definition of the functions tgx;ctgx;secx and cosecx can be given through lines.

Keywords: Trigonometric functions, Taylor's series, formula, product, integral, analytic representations of the function, power series.

Pages in journal: 581 - 585