$${ P }^{ 2 } - { 19 }^{ 2 } -6$$
$P^{2}-367$
$$P^{2}-361-6$$
$$P^{2}-367$$
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$2P$
$$\frac{\mathrm{d}}{\mathrm{d}P}(P^{2}-361-6)$$
$$\frac{\mathrm{d}}{\mathrm{d}P}(P^{2}-367)$$
$$2P^{2-1}$$
$$2P^{1}$$
$$2P$$
