分解因式(p²+q²)²-4p²q²=

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分解因式(p²+q²)²-4p²q²=

(p²+q²)²-4p²q²
=(p²+q²+2p^2q^2)(p²+q²-2p^2q^2)
=(p+q)^2((p-q)^2

(p²+q²)²-4p²q²=(p²-q²)²

原式=p^4+q^4+2p^2q^2-4p^2q^2
=p^4+q^4-2p^2q^2
=(p^2-q^2)^2