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D( x )
(a+b)^2 = 0
(a+b)^2 = 0
(a+b)^2 = 0
x in (-oo:+oo)
a^2-((b^2)/((a+b)^2)) = 0
(-1*b^2)/((a+b)^2)+a^2 = 0
(-1*b^2)/((a+b)^2)+(a^2*(a+b)^2)/((a+b)^2) = 0
a^2*(a+b)^2-1*b^2 = 0
a^4-b^2+a^2*b^2+2*a^3*b = 0
(a^4-b^2+a^2*b^2+2*a^3*b)/((a+b)^2) = 0
(a^4-b^2+a^2*b^2+2*a^3*b)/((a+b)^2) = 0 // * (a+b)^2
a^4-b^2+a^2*b^2+2*a^3*b = 0
x belongs to the empty set
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