to see the window used to graph
a function.

Xmax establishes the largest x value, the right end of the x
axis.
This value must be larger than the value entered for Xmin.
Xscl defines the spacing between tic marks along the x axis.
To turn off the marks, set Xscl to 0.
Ymin establishes the smallest y value, the bottom of the y axis.
Ymax establishes the largest y value, the top of the y axis.
This value must be larger than the value entered for Ymin.
Yscl defines the spacing between tic marks along the y axis.
To turn off the marks, set Yscl to 0.
Xres defines the distance, in pixels, between consecutive evaluated
values of x. The default is 1.
To change a setting, select that value using the cursor
keys and type the desired value. Press
.