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D( x )
x-3 < 0
(x-3)^0.5 = 0
x-3 < 0
x-3 < 0
x-3 < 0 // + 3
x < 3
(x-3)^0.5 = 0
(x-3)^0.5 = 0
x-3 = 0 // + 3
x = 3
x in (3:+oo)
(3*x)/((x-3)^0.5) = 0
3*x = 0 // : 3
x = 0
x in { 0}
x belongs to the empty set
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