(c²-a²-b²)²-4a²b²因式分解
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(c²-a²-b²)²-4a²b²

=(c²-a²-b²)²-(2ab)²

=(c²-a²-b²+2ab)(c²-a²-b²-2ab)

=[c²-(a²-2ab+b²)][c²-(a²+2ab+b²)]

=[c²-(a-b)²][c²-(a+b)²]

=(c+a-b)(c-a+b)(c+a+b)(c-a-b)