$$[2P-\frac{1}{2P}]$$
$2P-\frac{1}{2P}$
$$\frac{2P\times 2P}{2P}-\frac{1}{2P}$$
$$\frac{2P\times 2P-1}{2P}$$
$$\frac{4P^{2}-1}{2P}$$
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$\frac{\left(2P-1\right)\left(2P+1\right)}{2P}$