( p+q)квадрат * (p-q)квадрат
(p+q)²*(p-q)²=(p²+2pq+q²)*(p²-2pq+q²)=p⁴-2p³q+p²q²+2p³q-4p²q²+2pq³+p²q²-2pq³+q⁴=p⁴-2p²q²+q⁴