Calculator Help

Operation	Button	Shortcut key	Description
Backspace		Backspace	delete to left
Clear all			clear calculations screen
Reciprocal	x ^-1		x ^-1 = 1/x
Exp	E	e	xE y = x × 10^y
Answer	Ans		previous calculation result
Help			Show this page
Undo		Ctrl+Z	undo last editing change
Redo		Ctrl+Y	do again editing change
Left			move cursor to the left
Right			move cursor to the right
Select all		Ctrl+A	select expression
Copy		Ctrl+C	copy expression
Paste		Ctrl+V	paste expression