To show the available functions, click Fun. A popup menu displays the list of defined functions. Select a function from the menu to run that function. If the function is not defined, the value zero is returned. If you use the keyboard shortcut F, you can use the keyboard to specify the function, as shown in the following example:
Keyboard EntryFunctionF3F3The  application does not provide any default functions. You can store up to ten functions. To store a new function or edit an existing function, perform the following steps:Click Fun, then select Edit Functions from the popup menu.In the Edit Functions dialog, select a blank entry, or the function that you want to overwrite.Click on the Value field, then enter the new value. Use the keyboard shortcuts to invoke a  button. For example, enter 90K to calculate sine(90).Click on the Description field, then enter the new description. For example, Sine 90.Click OK to save your changes and close the Edit Functions dialog.
