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D( W )
W^2 = 0
W^2 = 0
W^2 = 0
1*W^2 = 0 // : 1
W^2 = 0
W = 0
W in (-oo:0) U (0:+oo)
(3*W^3*(W^2)^3)/(W^2) = 0
3*W^7 = 0 // : 3
W^7 = 0
W = 0
W in { 0}
W belongs to the empty set
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