 
Step 1  Select Your Equation
 Select an equation family from the 2D and 3D dropdown
menus. They are classified by field. If you do not recognize
your field, select [All 2D Equations].
 If you select a category, a list of formulas will appear by
name and by equation.
 If you select [All 2D Equations], you will see the following
screen:
 Click [List Of All 2D Equations]. You will then be shown a
screen of all equations by category, name, and formula.
 When you locate your formula, click on its name.
