$\displaystyle{\left({{t}}^{{2}}{{s}}^{{3}}\right)}\usepackage{cmbright}\Huge\$ , domain all s, $\displaystyle{s}\ne{0}\usepackage{cmbright}\Huge\$ and all r, $\displaystyle{r}\ne{0}\usepackage{cmbright}\Huge\$ and all t, $\displaystyle{t}\ne{0}\usepackage{cmbright}\Huge\$