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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)
(32*v^3-(8*v^2))/(4*v^2) = 0
(32*v^3-8*v^2)/(4*v^2) = 0
32*v^3-8*v^2 = 0
8*v^2*(4*v-1) = 0
4*v-1 = 0 // + 1
4*v = 1 // : 4
v = 1/4
8*v^2*(v-1/4) = 0
(8*v^2*(v-1/4))/(4*v^2) = 0
( 8*v^2 )
8*v^2 = 0 // : 8
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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