(a^2-b^2)(a^2+b^2)-(a^2-b^2)^2
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a^4-b^4-(a^4 - 2*a^2*b^2 + b^4 )
a^4 - b^4 - a^4 + 2*a^2*b^2 - b^4
2*a^2*b^2
a^4 - b^4 - a^4 + 2*a^2*b^2 - b^4
2*a^2*b^2
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