Commands:
$xxx$ - to show a math equation.
$$xxx$$ - to show a math equation on its own line and centered.
Example:
(1) $E=mc^2$ - To type a math expression that is on its own line.
or
(2) $$E=mc^2$$ - To type a math expression that is on its own line and centered.
Results:
(1)
(2)
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