$$45 { B }^{ 2 } - { B }^{ 2 }$$
$88B$
$$\frac{\mathrm{d}}{\mathrm{d}B}(44B^{2})$$
$$2\times 44B^{2-1}$$
$$88B^{2-1}$$
$$88B^{1}$$
$$88B$$
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$44B^{2}$
$$44B^{2}$$
