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D( x )
x^(1/12) = 0
x < 0
x^(1/12) = 0
x^(1/12) = 0
1*x^(1/12) = 0 // : 1
x^(1/12) = 0
x = 0
x < 0
x in (0:+oo)
((3*x^(1/4))^3)/(x^(1/12)) = 0
27*x^(2/3) = 0 // : 27
x^(2/3) = 0
x = 0
x in { 0}
x belongs to the empty set
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