4m(x-y)-2m^2(y-x)^3
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4m(x-y)-2m^2(y-x)^3
4m(x-y)-2m^2(y-x)^3
4m(x-y)-2m^2(y-x)^3
4m(x-y)-2m²(y-x)³
=4m(x-y)+2m²(x-y)³
=2m(x-y)[2-m(x-y)²]
=2m(x-y)(2-mx²+2mxy-my²)
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4m(x-y)-2m^2(y-x)^3
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