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D( v )
v-3 = 0
v-3 = 0
v-3 = 0
v-3 = 0 // + 3
v = 3
v in (-oo:3) U (3:+oo)
v-(v^2*(((((3/2)*v)/(v-3))*(v-3))/6)) = 0
(-1/4)*v^3+v = 0
v-1/4*v^3 = 0
v*(1-1/4*v^2) = 0
-1/4*v^2 = -1 // : -1/4
v^2 = 4
v^2 = 4 // ^ 1/2
abs(v) = 2
v = 2 or v = -2
v = 0
v = 0
v in { 2, -2, 0 }
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