User's Manual

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13.1.10 RETURN FORMULA
There may be times, after viewing a result, that you wish to be reminded what
expression you used to obtain that result. The "return formula" function allows
you to return the expression you just entered
When your result is displayed, press "Enter-R", or select "Return Formula" from
the menu.
The expression you entered to obtain your current result is displayed.
13.1.11 OPTION SETTINGS
You can activate the "Option Settings" by pressing "Enter" on the menu option,
or from your calculation line, press "Enter-O".
The "Option Settings" dialog contains combo boxes for changing various
settings, an "OK" button, and a "Cancel" button. The "available settings are
"Angle Unit", "Calculator Braille Code", “decimal places to display” and “Display
Using Scientific notation”. You can navigate among the controls using “F3” or
“Space-F3”. Use "Space" to change the value of each setting.
When setting the angle unit, if you select "Radian", you can get the PI value
while using the trigonometric function. If you select "Degree" and activate PI,
you will get a wrong answer as this is not a valid calculation.
You can set the Calculator Braille code to computer Braille, Nemeth or UEB
math Braille as described previously. You can use "Space-G" to change this
setting from anywhere in the calculator.