$$( \frac { 2 m ^ { 2 } n ^ { 2 } } { 4 n ^ { - 2 } } )$$
$\frac{m^{2}n^{4}}{2}$
$$\frac{m^{2}n^{2}}{2n^{-2}}$$
$$\frac{m^{2}n^{4}}{2}$$
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$mn^{4}$
