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D( k )
(((2*k)^4)/9)*k^6 = 0
(((2*k)^4)/9)*k^6 = 0
(((2*k)^4)/9)*k^6 = 0
16/9*k^10 = 0 // : 16/9
k^10 = 0
k = 0
k in (-oo:0) U (0:+oo)
(((-5*k^3)/3)*k^6)/((((2*k)^4)/9)*k^6) = 0
-15/16*k^-1 = 0 // : -15/16
k^-1 = 0
k należy do O
k belongs to the empty set
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