Here is some regularly sized text for comparison. E=mc2{\displaystyle E=mc^{2}}
x=−b±b2−4ac 2a/h{\displaystyle x={\frac {-b\pm {\sqrt {b^{2}-4ac\ }}}{2a}}/h}
Φ(x)=12π∫−∞xe−t2/2dt{\displaystyle \Phi (x)={\frac {1}{\sqrt {2\pi }}}\int _{-\infty }^{x}e^{-t^{2}/2}\,\mathrm {d} t}