$$1y \times 5y$$
$5y^{2}$
$$1y^{2}\times 5$$
$$5y^{2}$$
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$10y$
$$\frac{\mathrm{d}}{\mathrm{d}y}(1y^{2}\times 5)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(5y^{2})$$
$$2\times 5y^{2-1}$$
$$10y^{2-1}$$
$$10y^{1}$$
$$10y$$
