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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6-2/v = (-1/2)*v-2+12 // - (-1/2)*v-2+12
2-((-1/2)*v)-2/v-12+6 = 0
(1/2)*v-2/v-12+2+6 = 0
1/2*v^1-2*v^-1-4*v^0 = 0
(1/2*v^2-4*v^1-2*v^0)/(v^1) = 0 // * v^2
v^1*(1/2*v^2-4*v^1-2*v^0) = 0
v^1
(1/2)*v^2-4*v-2 = 0
(1/2)*v^2-4*v-2 = 0
DELTA = (-4)^2-(-2*4*(1/2))
DELTA = 20
DELTA > 0
v = (20^(1/2)+4)/(2*(1/2)) or v = (4-20^(1/2))/(2*(1/2))
v = 2*5^(1/2)+4 or v = 4-2*5^(1/2)
v in { 4-2*5^(1/2), 2*5^(1/2)+4}
v in { 4-2*5^(1/2), 2*5^(1/2)+4 }
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