$$2 { h }^{ 2 } - { h }^{ 2 }$$
$2h$
$$\frac{\mathrm{d}}{\mathrm{d}h}(h^{2})$$
$$2h^{2-1}$$
$$2h^{1}$$
$$2h$$
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$h^{2}$
$$h^{2}$$
