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D( k )
k^-2*((2*k^3)/3) = 0
k = 0
k^-2*((2*k^3)/3) = 0
k^-2*((2*k^3)/3) = 0
2/3*k = 0 // : 2/3
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(k^-2*((2*k^3)/3))^-2 = 0
9/4*k^-2 = 0 // : 9/4
k^-2 = 0
k należy do O
k belongs to the empty set
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