(y+b)^2(y-b)^2=
((y+b)×(y-b))^2=
(y^2-b^2)^2=
y^4-2b^2y^2+b^4
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(y+b)^2(y-b)^2=
((y+b)×(y-b))^2=
(y^2-b^2)^2=
y^4-2b^2y^2+b^4