$$4X^{3}\cdot3X^{3}$$
$12X^{6}$
$$4X^{6}\times 3$$
$$12X^{6}$$
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$72X^{5}$
$$\frac{\mathrm{d}}{\mathrm{d}X}(4X^{6}\times 3)$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(12X^{6})$$
$$6\times 12X^{6-1}$$
$$72X^{6-1}$$
$$72X^{5}$$