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D( v )
1*v^2 = 0
1*v^2 = 0
1*v^2 = 0
v^2 = 0
1*v^2 = 0 // : 1
v^2 = 0
v = 0
v in (-oo:0) U (0:+oo)
(5*v^2)/(1*v^2) = 0
(5*v^2)/(v^2) = 0
5 = 0
v belongs to the empty set
v belongs to the empty set
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