$$\frac{\alpha^{2}}{3}$$
$\frac{2\alpha }{3}$
$$2\times \frac{1}{3}\alpha ^{2-1}$$
$$\frac{2}{3}\alpha ^{2-1}$$
$$\frac{2}{3}\alpha ^{1}$$
$$\frac{2}{3}\alpha $$
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$\frac{\alpha ^{2}}{3}$
