因式分解x^2y^2-y^4-12xy+36y^2,

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因式分解x^2y^2-y^4-12xy+36y^2,因式分解x^2y^2-y^4-12xy+36y^2,因式分解x^2y^2-y^4-12xy+36y^2,x^2y^2-y^4-12xy+36y^2=

因式分解x^2y^2-y^4-12xy+36y^2,
因式分解x^2y^2-y^4-12xy+36y^2,

因式分解x^2y^2-y^4-12xy+36y^2,
x^2y^2-y^4-12xy+36y^2=x^2y^2-12xy+36y^2-y^4=(xy-6)^2-y^4=(xy-y^2-6)(xy+y^2-6)

^ 是什么意思