GraphSight Junior

If you are searching for a computer program that can plot simple graphs on your PC, GraphSight Junior is what you are looking for.

This utility is feature rich and comprehensive. It plots 2D graphs with easy navigation, and it’s well suited for high school and college math students.
It can plot Cartesian, polar, table defined, as well as specialty graphs, such as trigonometric functions (sin, cos, tg, etc). The program also comprises a simple data and formula input format, which makes it a very useful tool for solving algebra and calculus problems at home or in class. Its axis options are customizable (style, color, grid, width), as well as data import/export facilities.
This Junior version doesn't permit you to print graphs, but you can always export the graph to a BMP image file first and then do your stuff. The program is free but requires registration and will displays notice screens until you do register your copy.
GraphSight has been made for Windows 98/NT/ME/2000/XP and requires Internet Explorer 5+ installed.