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Cartesian functions can displayed with their first and second derivative curves.
To draw derivative curves for a function you have two options.
If you right click on an existing function you will see this mini-menu
You can select 1st and 2nd derivative curves on this mini menu.
You can access the Function Properties by pushing the Function Properties option on the Quick Entry screen.
You can turn the derivative curves on or off and can change the line style, weight and colour.