(a²-b²)²+6(a²-b²)+9

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(a²-b²)²+6(a²-b²)+9(a²-b²)²+6(a²-b²)+9(a²-b&#

(a²-b²)²+6(a²-b²)+9
(a²-b²)²+6(a²-b²)+9

(a²-b²)²+6(a²-b²)+9
原式=(a²-b²+3)²