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D( w )
(-w)^4 = 0
(-w)^4 = 0
(-w)^4 = 0
1*w^4 = 0 // : 1
w^4 = 0
w = 0
w in (-oo:0) U (0:+oo)
-2/((-w)^4) = 0
-2*w^-4 = 0 // : -2
w^-4 = 0
w naleu017Cy do O
w belongs to the empty set
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