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