$$5 \frac { 9 } { 1 n }$$
$\frac{45}{n}$
$$\frac{5\times 9}{1n}$$
$$\frac{45}{1n}$$
$$\frac{45}{n}$$
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$-\frac{45}{n^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}n}(\frac{5\times 9}{1n})$$
$$\frac{\mathrm{d}}{\mathrm{d}n}(\frac{45}{1n})$$
$$-45n^{-1-1}$$
$$-45n^{-2}$$
