$$\frac { n } { 5 - 1 }$$
$\frac{1}{4} = 0.25$
$$\frac{\mathrm{d}}{\mathrm{d}n}(\frac{n}{4})$$
$$\frac{1}{4}n^{1-1}$$
$$\frac{1}{4}n^{0}$$
$$\frac{1}{4}\times 1$$
$$\frac{1}{4}$$
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$\frac{n}{4}$
$$\frac{n}{4}$$
