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