$$E(m)=m^{3}-m:6$$
$m^{3}-\frac{m}{6}$
$$\frac{6m^{3}}{6}-\frac{m}{6}$$
$$\frac{6m^{3}-m}{6}$$
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$\frac{m\left(6m^{2}-1\right)}{6}$
$$m\left(6m^{2}-1\right)$$
$$\frac{m\left(6m^{2}-1\right)}{6}$$
