Fill in the powers of a and b to make the equation true: $\displaystyle{{\left({{a}}^{{-{{2}}}}{b}\right)}}^{{-{{2}}}}\cdot{{\left({{a}}^{{2}}{{b}}^{{3}}\right)}}^{{2}}={{a}}^{?}{{b}}^{?}\usepackage{cmbright}\Huge\$