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\frac{2}{3}-\sqrt[3]{\frac{8}{27}}
The square of \sqrt{\frac{2}{3}} is \frac{2}{3}.
\frac{2}{3}-\frac{2}{3}
Calculate \sqrt[3]{\frac{8}{27}} and get \frac{2}{3}.
0
Subtract \frac{2}{3} from \frac{2}{3} to get 0.
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