**Trigonometric functions** are elementary functions. They have inherent periodicity, that is, repeatability on certain segments of the coordinate plane. The period is denoted by the letter** T**.

Trigonometric functions include:

function of sine: **y = sin(x)**, the graph of which is sine wave

- the cosine function
**y = cos(x)**, the graph of which is a cosinusoid

- function of the tangent
**y = tg(x)**,*for graph y=tan(x)*the graph of which is the tangensoid

- the function of cotangent y =
**ctg(x)***for graph y=cot(x)*whose graph is the cotangensoid.

All graphics are built with our **graphical calculator**

Sinus and cosine graphs are curved lines along the **X **axis.

Tangent and cotangent graphs are many curved lines along the **Y **axis.

**Plot a graph of the trigonometric function online**

Example trigonometry function graph: