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D( x )
x < 0
x^0.5 = 0
x < 0
x^0.5 = 0
x^0.5 = 0
1*x^0.5 = 0 // : 1
x^0.5 = 0
x = 0
x in (0:+oo)
x/(x^0.5) = 0
1*x^0.5 = 0 // : 1
x^0.5 = 0
x = 0
x in { 0}
x belongs to the empty set
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