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D( v )
v^2-4 = 0
v^2-4 = 0
v^2-4 = 0
1*v^2 = 4 // : 1
v^2 = 4
v^2 = 4 // ^ 1/2
abs(v) = 2
v = 2 or v = -2
v in (-oo:-2) U (-2:2) U (2:+oo)
(v-2)/(v^2-4) = 0
v-2 = 0 // + 2
v = 2
v in { 2}
v belongs to the empty set
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