[tex](\frac{1}{3} x^{-1}y^{2})^{-2} = (\frac{y^{2}}{3x})^{-2} = (\frac{y^{4}}{9x^{2}})^{-1} = \frac{9x^{2}}{y^{4}}[/tex]
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[tex](\frac{1}{3} x^{-1}y^{2})^{-2} = (\frac{y^{2}}{3x})^{-2} = (\frac{y^{4}}{9x^{2}})^{-1} = \frac{9x^{2}}{y^{4}}[/tex]