$$\frac { 1 } { 2 x ^ { 2 } y ^ { 2 } }$$
$\frac{1}{2\left(xy\right)^{2}}$
$$\frac{1}{2x^{2}y^{2}}$$
$$\frac{1}{2}\times \frac{1}{x^{2}}\times \frac{1}{y^{2}}$$
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$-\frac{1}{y^{2}x^{3}}$