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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x^-4*(x/16)*(-4*x^3)^2 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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