$$(\frac{2}{5}x-\frac{2}{3})^{2}$$
$\frac{4\left(3x-5\right)^{2}}{225}$
$$\frac{4}{25}x^{2}-\frac{8}{15}x+\frac{4}{9}$$
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$\frac{4x^{2}}{25}-\frac{8x}{15}+\frac{4}{9}$