$$( { x }^{ 2 } + \frac{ 2 }{ 3 } )( { x }^{ 2 } + \frac{ 2 }{ 3 } )$$
$\frac{\left(3x^{2}+2\right)^{2}}{9}$
$$\left(x^{2}+\frac{2}{3}\right)^{2}$$
$$\left(x^{2}\right)^{2}+\frac{4}{3}x^{2}+\frac{4}{9}$$
$$x^{4}+\frac{4}{3}x^{2}+\frac{4}{9}$$
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$x^{4}+\frac{4x^{2}}{3}+\frac{4}{9}$
