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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(1/6)*k^2 = (1/3)*k^2-(1/k) // - (1/3)*k^2-(1/k)
(1/6)*k^2-((1/3)*k^2)+1/k = 0
(1/6)*k^2+(-1/3)*k^2+1/k = 0
k^-1-1/6*k^2 = 0
k^-1*(1-1/6*k^3) = 0
-1/6*k^3 = -1 // : -1/6
k^3 = 6
k^3 = 6 // ^ 1/3
k = 6^(1/3)
1/k = 0
1*k^-1 = 0 // : 1
k^-1 = 0
k naleu017Cy do O
k = 6^(1/3)
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