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