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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
k^-9*(((25*k^-2)^2)/5) = 0
125*k^-13 = 0 // : 125
k^-13 = 0
k należy do O
k belongs to the empty set
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