Extended mode offering special features:
To open the history click somewhere into the display in which the results are presented (2nd from top). Use the underscore (_) next to the decimal point to separate arguments in the special feature mode (or just type a space). If, using the Pythagoras function, a negative argument is specified, it will be subtracted! The rest should work straight forward. For additional support, please be aware of the tool tips, that appear when the mouse cursor is placed over a button.