(1+p)²(1+q²)-(1+q)²(1+p²)

(1+p)²(1+q²)-(1+q)²(1+p²)
(1+p)²(1+q²)-(1+q)²(1+p²)

(1+p)²(1+q²)-(1+q)²(1+p²)
(1+p)²(1+q²)-(1+q)²(1+p²)
=（1+p²+2p）(1+q²)-(1+q²+2q)(1+p²)
=1+q²+p²+p²q²+2p+2pq²-1-p²-q²-p²q²-2q-2p²q
=2(p-q)+2pq(q-p)
=2(1-pq)(p-q);
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