$64m^2\:-n^2$
$\frac{d^2}{dx^2}=2$
$39.47\cdot6.02\cdot10^2^3$
$144m^2-72my+9y^2$
$\:\left(\frac{\sqrt{x}}{2}-\frac{2}{\sqrt{x}}\right)^2$
$a^2b-a^2b-3a^2b$
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