$$(8 { P }^{ 4 } -3 { R }^{ 2 } )+6 { P }^{ 4 } -12 { R }^{ 2 } +15)$$
$14P^{4}-15R^{2}+15$
$$14P^{4}-3R^{2}-12R^{2}+15$$
$$14P^{4}-15R^{2}+15$$
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$56P^{3}$
