3y(x-1)^2-4x(1-x)^2
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3y(x-1)^2-4x(1-x)^23y(x-1)^2-4x(1-x)^23y(x-1)^2-4x(1-x)^23y(x-1)^2-4x(1-x)^2=3y(x-1)^2-4x(x-1)^2=(x-
3y(x-1)^2-4x(1-x)^2
3y(x-1)^2-4x(1-x)^2
3y(x-1)^2-4x(1-x)^2
3y(x-1)^2-4x(1-x)^2
=3y(x-1)^2-4x(x-1)^2
=(x-1)^2(3y-4x)