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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y^0*x^-4*(((x^3)^3)/2) = 0
x^-4*(((x^3)^3)/2) = 0
1/2*x^5 = 0 // : 1/2
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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