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Here is some regularly sized text for comparison. $E=mc^{2}$

$x={\frac {-b\pm {\sqrt {b^{2}-4ac\ }}}{2a}}/h$

$\Phi (x)={\frac {1}{\sqrt {2\pi }}}\int _{-\infty }^{x}e^{-t^{2}/2}\,\mathrm {d} t$