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Menues
Calculator has build-in menues to help users accessing functions and operators.
There is catalog of all functions and operators available after pressing [CAT] key:

Press [UP] and [DOWN] keys to navigate through menu, [F6] keys to accept selected function/operator or [F5] to cancel.
Additional menues (such as functions/operators gruped by mean) are available after pressing [Mode 1] and [SYMB] keys:

As you can see thanks menues system user has different ways to access functions/operator.
See also:
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