$$2 a \times 2 a \times 4 a ^ { 2 }$$
$16a^{4}$
$$2a^{2}\times 2\times 4a^{2}$$
$$2a^{4}\times 2\times 4$$
$$4a^{4}\times 4$$
$$16a^{4}$$
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$64a^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2a^{2}\times 2\times 4a^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2a^{4}\times 2\times 4)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(4a^{4}\times 4)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(16a^{4})$$
$$4\times 16a^{4-1}$$
$$64a^{4-1}$$
$$64a^{3}$$
