      2            2
xe = a  + 2*a*b + b
latex:\black$\displaystyle \begin{equation}$
latex:\black$\displaystyle  \mathrm{xe~=~}a^2+2\*a\*b+b^2$
latex:\black$\displaystyle \end{equation}$
latex:\black$\displaystyle  \mathrm{xe~=~}a^2+2\*a\*b+b^2$
latex:\black$\displaystyle  \mathrm{\$xe~=~}a^2+2\*a\*b+b^2\mathrm{\$}$
