$$\frac{ { a }^{ 24 } }{ { a }^{ 21 } }$$
$a^{3}$
$$\frac{a^{24}}{a^{21}}$$
$$a^{24-21}$$
$$a^{3}$$
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$3a^{2}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{1}a^{24-21})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(a^{3})$$
$$3a^{3-1}$$
$$3a^{2}$$
