$${ a }^{ 2 } \times 5a=$$
$15a^{2}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(a^{3}\times 5)$$
$$3\times 5a^{3-1}$$
$$15a^{3-1}$$
$$15a^{2}$$
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$5a^{3}$
$$a^{3}\times 5$$
