$$10 x ^ { - 1 } y ^ { 3 } \times x y$$
$10y^{4}$
$$10y^{3}y$$
$$10y^{4}$$
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$40y^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}y}(10y^{3}y)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(10y^{4})$$
$$4\times 10y^{4-1}$$
$$40y^{4-1}$$
$$40y^{3}$$
