$$5\frac{q}{10}$$
$\frac{1}{2} = 0.5$
$$\frac{\mathrm{d}}{\mathrm{d}q}(\frac{q}{2})$$
$$\frac{1}{2}q^{1-1}$$
$$\frac{1}{2}q^{0}$$
$$\frac{1}{2}\times 1$$
$$\frac{1}{2}$$
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$\frac{q}{2}$
$$\frac{q}{2}$$