(0.5×^2+0.4y^2)(0.5×^2-0.4y)^2
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0.5x^2(0.5x^2-0.4y^2)+0.4y^2(0.5x^2-0.4y^2)
0.25x^4-0.20x^2y^2+0.20x^2y^2-0.16y^4
0.25x^4-0.16y^4
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