$$3a^{3}-b^{0}$$
$9a^{2}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(3a^{3}-1)$$
$$3\times 3a^{3-1}$$
$$9a^{3-1}$$
$$9a^{2}$$
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$3a^{3}-1$
$$3a^{3}-1$$