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Square Roots
How to type 
To get a square root sign, press the Control key and the 2 key (or the @ key) at the same time.
Press 2 or @
Type inside the placeholder (which is already selected).
Type x
Press the Control key and the Space bar at the same time to get out of the square root.
Press
How to type 
Repeat the steps of the example for  .
Press @, type x, press
Type the second square root in the same way as the first.
Press @, type y, press
How to type 
Press Control-@ to get a square root sign.
Press@
Type the expression in the placeholder (which is already selected). Get out of the square root sign by pressing Control-Space.
Type x y, press
Another way to type 
Start by typing the expression that will be inside the square root.
Type x y
Select the expression. (You can select by dragging, by pressing Control-Dot repeatedly, or by clicking the expression repeatedly.)
Select x y
Press Control-@ to put a square root around the selection. Get out of the square root by pressing Control-Space.
Press @, press
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