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D( w )
w < 0
w^0.5 = 0
w < 0
w^0.5 = 0
w^0.5 = 0
1*w^0.5 = 0 // : 1
w^0.5 = 0
w = 0
w in (0:+oo)
(2*w^3)/(w^0.5) = 0
2*w^2.5 = 0 // : 2
w^2.5 = 0
w = 0
w in { 0}
w belongs to the empty set
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