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因式分解:(x²-y²)²-8(x²+y²)+16. 谢谢!

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因式分解:(x²-y²)²-8(x²+y²)+16. 谢谢!
因式分解:(x²-y²)²-8(x²+y²)+16. 谢谢!
(x²-y²)²-8(x²+y²)+16
=(x²-y²)² -8(x²-y²)+16-16y²
=(x²-y²-4)²-16y²
=(x²-y²-4+4y)(x²-y²-4-4y)
=[x²-(y²-4y+4)][x²-(y²+4y+4)]
=[x²-(y-2)²][x²-(y+2)²]
=(x+y-2)(x-y+2)(x+y+2)(x-y-2)