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D( k )
7*k^-8 = 0
k = 0
7*k^-8 = 0
7*k^-8 = 0
7*k^-8 = 0 // : 7
k^-8 = 0
k naleu017Cy do O
k = 0
k = 0
k in (-oo:0) U (0:+oo)
((49*k^-2)^3)/(7*k^-8) = 0
16807*k^2 = 0 // : 16807
k^2 = 0
k = 0
k in { 0}
k belongs to the empty set
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