$${ y }^{ 2 } + { y }^{ 2 }$$
$4y$
$$\frac{\mathrm{d}}{\mathrm{d}y}(2y^{2})$$
$$2\times 2y^{2-1}$$
$$4y^{2-1}$$
$$4y^{1}$$
$$4y$$
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$2y^{2}$
$$2y^{2}$$