A. Overview
3. TRACE
The trace key can be used to help you set a window, but TRACE is most useful in graph analysis, which is covered in Working with Graphs.
When you access TRACE, the screen will come up showing the graph, and the initial values will be in the middle of the screen. You can use the up and down cursors to move the cursor to a value, or you can enter a value of x that is within the window.
Note: If you are using the ZDECM window, the trace will move in increments of 0.1. In other windows, you will find it better to just enter the value of x you wish to evaluate.
You can use the cursor
to trace to a value. 
You can enter a value of
x
and then press ENTER. 

You cannot enter a value of x that is outside of the interval, [Xmin,Xmax]. If you need to find function values outside of this interval, you will have to use the TABLE.