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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v-(1/v)-3 = 0
v-v^-1-3 = 0
1*v^1-1*v^-1-3*v^0 = 0
(1*v^2-3*v^1-1*v^0)/(v^1) = 0 // * v^2
v^1*(1*v^2-3*v^1-1*v^0) = 0
v^1
v^2-3*v-1 = 0
v^2-3*v-1 = 0
DELTA = (-3)^2-(-1*1*4)
DELTA = 13
DELTA > 0
v = (13^(1/2)+3)/(1*2) or v = (3-13^(1/2))/(1*2)
v = (13^(1/2)+3)/2 or v = (3-13^(1/2))/2
v in { (3-13^(1/2))/2, (13^(1/2)+3)/2}
v in { (3-13^(1/2))/2, (13^(1/2)+3)/2 }
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