# Symmetry of the Graph of y = cos(t)

- Author:
- Ted Sundstrom

- Topic:
- Symmetry

This can be used to illustrate the symmetry of the graph of

*y*= cos(*x*). The graph is symmetric about the*y*-axis. This is illustrated by showing that whenever a point (*t*, cos(*t*)) is on the graph, the point (*-t*, cos(*t*)) is also on the graph. Use the slider to change the value of*t*.