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D( v )
3*v^3 = 0
3*v^3 = 0
3*v^3 = 0
3*v^3 = 0 // : 3
v^3 = 0
v = 0
v in (-oo:0) U (0:+oo)
(6*v^6-(27*v^4))/(3*v^3) = 0
(6*v^6-27*v^4)/(3*v^3) = 0
6*v^6-27*v^4 = 0
3*v^4*(2*v^2-9) = 0
2*v^2 = 9 // : 2
v^2 = 9/2
v^2 = 9/2 // ^ 1/2
abs(v) = (9/2)^(1/2)
v = (9/2)^(1/2) or v = -(9/2)^(1/2)
3*v^4*(v-(9/2)^(1/2))*(v+(9/2)^(1/2)) = 0
(3*v^4*(v-(9/2)^(1/2))*(v+(9/2)^(1/2)))/(3*v^3) = 0
( 3*v^4 )
3*v^4 = 0 // : 3
v^4 = 0
v = 0
( v+(9/2)^(1/2) )
v+(9/2)^(1/2) = 0 // - (9/2)^(1/2)
v = -(9/2)^(1/2)
( v-(9/2)^(1/2) )
v-(9/2)^(1/2) = 0 // + (9/2)^(1/2)
v = (9/2)^(1/2)
v in { 0}
v in { -(9/2)^(1/2), (9/2)^(1/2) }
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