$$2a \times 2a$$
$4a^{2}$
$$2a^{2}\times 2$$
$$4a^{2}$$
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$8a$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2a^{2}\times 2)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(4a^{2})$$
$$2\times 4a^{2-1}$$
$$8a^{2-1}$$
$$8a^{1}$$
$$8a$$
