计算(x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)
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(x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)
=(x-y)(x+y){(x+y)(x-y)-(x^2+y^2)}
=(x-y)(x+y)(x^2-y^2-x^2-y^2)
=-2y^2(x-y)(x+y)
=(x-y)(x+y){(x+y)(x-y)-(x^2+y^2)}
=(x-y)(x+y)(x^2-y^2-x^2-y^2)
=-2y^2(x-y)(x+y)
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(x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)
=(x²-y²)(x²-y²-x²-y²)
=(x²-y²)(-4y²)
=4y^4-4x²y²
=(x²-y²)(x²-y²-x²-y²)
=(x²-y²)(-4y²)
=4y^4-4x²y²
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(x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)
=[(x+y)(x-y)]^2-(x^2-y^2)(x^2+y^2)
=x^4-2x^2y^2+y^4-x^4+y^4
=2y^4-2x^2y^2
=[(x+y)(x-y)]^2-(x^2-y^2)(x^2+y^2)
=x^4-2x^2y^2+y^4-x^4+y^4
=2y^4-2x^2y^2
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2y^4-2x^2y^2
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