This calculator allows you to perform standard and scientific calculations and to graph the functions.
Press <F> to open graph-creating screen.
Use the numeric keys to enter figures. Use <.> to insert a decimal point.
<Fn> changes the sign of the displayed number ("+-" button).
<E> allows the entry of scientific notation numbers ("e" button).
<Esc> or <C> clears the current calculation ("C" button). 
<Space> clears the displayed number ("CE" button). 
<BkSp> deletes the last digit of the displayed number. 
<Enter> or <=> performs the operation on the previous two numbers ("=" button). 
<Left/Right arrows> select the function groups.
In each group, use <Del> for the operation of the first function button, <Ins> for the second, <Tab> for the third, <Select> for the fourth.
Press <Esc> twice to exit.
Version 1.3.11
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