# Trigonometric Functions of Real Numbers

- Author:
- Irina Boyadzhiev

This applet illustrates the definitions of the trigonometric functions with real arguments between and . Let and let the point be the point on the unit circle corresponding to . Then and .
Enter for the coordinate of and for the coordinate of . For example, for the definition of we will enter in the input box for .
The applet traces the point as we drag point along the unit circle or animate it.