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D( v )
4*v^2 = 0
4*v^2 = 0
4*v^2 = 0
4*v^2 = 0 // : 4
v^2 = 0
v = 0
v in (-oo:0) U (0:+oo)
(12*v^2-(36*v^3))/(4*v^2) = 0
(12*v^2-36*v^3)/(4*v^2) = 0
12*v^2-36*v^3 = 0
12*v^2*(1-3*v) = 0
1-3*v = 0 // - 1
-3*v = -1 // : -3
v = -1/(-3)
v = 1/3
12*v^2*(v-1/3) = 0
(12*v^2*(v-1/3))/(4*v^2) = 0
( 12*v^2 )
12*v^2 = 0 // : 12
v^2 = 0
v = 0
( v-1/3 )
v-1/3 = 0 // + 1/3
v = 1/3
v in { 0}
v = 1/3
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