Answer
1-x$^\frac{4}{3}$
Work Step by Step
(A+B)(A-B)=A$^2$-B$^2$
(1+x$^\frac{2}{3}$)(1-x$^\frac{2}{3}$)
(1)$^2$-(x$^\frac{2}{3}$)$^2$
1-x$^\frac{4}{3}$
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