The graph tool uses the equation engine from FX Equation so entering functions is extremely easy AND you can see a fully formatted version of your function as you type.
Functions are entered into the graph tool by typing what you see WITHOUT any formatting. On most occasions the graph tool will automatically format your function for you.
For example. If you want to graph the function 3x3 + 2x2 - 7 simply enter 3x3+2x2-7 into the function entry area. the graph tool automatically recognizes and formats the powers and displays the formatted function for you to check your entry.
Simple fractions are also entered as you see them. In other words if you want to graph
you enter 3x3/2x4 and the graph tool will automatically build the appropriate fraction. Most simple functions can be entered this way, with NO formatting on your part. More complicated functions will require some limited extra input on your part.
Regional Issues:
The graph tool automatically detects which style of decimal point you use (3.2 or 3,2). If you use a , as a decimal point, you must use a semi colon to separate coordinates in points and vectors (eg (3,2; 1,7) ) and a colon to separate domains from functions or the two components of parametric functions.