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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(1/4)*h^2 = (1/2)*h^2-(1/h) // - (1/2)*h^2-(1/h)
(1/4)*h^2-((1/2)*h^2)+1/h = 0
(1/4)*h^2+(-1/2)*h^2+1/h = 0
h^-1-1/4*h^2 = 0
h^-1*(1-1/4*h^3) = 0
-1/4*h^3 = -1 // : -1/4
h^3 = 4
h^3 = 4 // ^ 1/3
h = 4^(1/3)
1/h = 0
1*h^-1 = 0 // : 1
h^-1 = 0
h należy do O
h = 4^(1/3)
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