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D( v )
v^5 = 0
v^5 = 0
v^5 = 0
1*v^5 = 0 // : 1
v^5 = 0
v = 0
v in (-oo:0) U (0:+oo)
(3*v^4)/(v^5) = 0
3*v^-1 = 0 // : 3
v^-1 = 0
v należy do O
v belongs to the empty set
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