If you want to use mathematical equations in your screen (i.e. formulae with superscript and subscript characters) then by far the best method is to use them as a screenshot or image. This is because equations often require specialist fonts, which are not always installed on the trainee's or student's computer.
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One approach is to use an equation editor such as MathType and simply save the equation as a GIF file (choose Save As from the File menu, and then select GIF as the file type). This GIF file can then be imported as a picture. Simply press the Picture button in Question Tools Editor and select your equation GIF when the open dialog is displayed.