       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$\displaystyle  \mathrm{\$xe~:=~}a^2+2\*a\*b+b^2\mathrm{\$}$
