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$latex \begin{math}E=mc^2 \end{math}


\displaystyle \hat{f}\left(\bar{x}\right)=\theta_{o}+\theta_f{1}{\bar{x}}_\mathbf{1}+\theta_\mathbf{2}{\bar{x}}_\mathbf{2}+{\ldots}+\theta_{k}{\bar{x}}_k (1)

i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right>

\frac{ABC}{CDEF}  $S_b\;=\;\int E(z)z^2dz$$
E=mc^2 

$ latex \displaystyle \sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}. $