$$7A \times 8A$$
$56A^{2}$
$$7A^{2}\times 8$$
$$56A^{2}$$
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$112A$
$$\frac{\mathrm{d}}{\mathrm{d}A}(7A^{2}\times 8)$$
$$\frac{\mathrm{d}}{\mathrm{d}A}(56A^{2})$$
$$2\times 56A^{2-1}$$
$$112A^{2-1}$$
$$112A^{1}$$
$$112A$$
