Answer
$\frac{x^{6}}{6y}$
Work Step by Step
$\sqrt \frac{x^{12}}{36y^{2}}=\frac{\sqrt {x^{12}}}{\sqrt {36y^{2}}}=\frac{(x^{12})^{\frac{1}{2}}}{\sqrt {6^{2}\times y^{2}}}=\frac{x^{6}}{6y}$
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