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D( v )
v^-3 = 0
v = 0
v^-3 = 0
v^-3 = 0
1*v^-3 = 0 // : 1
v^-3 = 0
v naleu017Cy do O
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-3/(v^-3) = 0
-3*v^3 = 0 // : -3
v^3 = 0
v = 0
v in { 0}
v belongs to the empty set
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