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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(2/w)*w*((8*w^9)/9) = 0
16/9*w^9 = 0 // : 16/9
w^9 = 0
w = 0
w in { 0}
w belongs to the empty set
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