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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(1/(-20))*k^-9 = 0
-1/20*k^-9 = 0 // : -1/20
k^-9 = 0
k naleu017Cy do O
k belongs to the empty set
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