$$\frac { 2 ^ { 4 } \times a ^ { 5 } } { 4 ^ { 2 } \times a }$$
$a^{4}$
$$\frac{2^{4}a^{5}}{4^{2}a^{1}}$$
$$\frac{2^{4}a^{5-1}}{4^{2}}$$
$$\frac{2^{4}a^{4}}{4^{2}}$$
$$\frac{16a^{4}}{4^{2}}$$
$$\frac{16a^{4}}{16}$$
$$a^{4}$$
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$4a^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{2^{4}a^{4}}{4^{2}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{16a^{4}}{4^{2}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{16a^{4}}{16})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(a^{4})$$
$$4a^{4-1}$$
$$4a^{3}$$