$$u\cdot4\div6$$
$\frac{2}{3} = 0.6666666666666666$
$$\frac{\mathrm{d}}{\mathrm{d}u}(u\times \frac{2}{3})$$
$$\frac{2}{3}u^{1-1}$$
$$\frac{2}{3}u^{0}$$
$$\frac{2}{3}\times 1$$
$$\frac{2}{3}$$
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$\frac{2u}{3}$
$$u\times \frac{2}{3}$$
