$$5/6x4/10$$
$\frac{1}{12} = 0.08333333333333333$
$$\frac{\mathrm{d}}{\mathrm{d}x_{4}}(\frac{1}{12}x_{4})$$
$$\frac{1}{12}x_{4}^{1-1}$$
$$\frac{1}{12}x_{4}^{0}$$
$$\frac{1}{12}\times 1$$
$$\frac{1}{12}$$
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$\frac{x_{4}}{12}$
$$\frac{1}{12}x_{4}$$