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