$$(3,1)y(1,5)$$
$4,65$
$$\frac{\mathrm{d}}{\mathrm{d}y}(4,65y)$$
$$4,65y^{1-1}$$
$$4,65y^{0}$$
$$4,65\times 1$$
$$4,65$$
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$\frac{93y}{20}$
$$4,65y$$