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Evaluate the iterated integral by converting to polar coordinates. Enter an exact form, do not use decimal approximation.

${\displaystyle \underset{-3}{\overset{3}{}}}{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\sqrt[\phantom{2}]{\frac{9-x^2}{9-x^2}}8\sqrt[\phantom{2}]{x^2{y}^2}dydx$

$$