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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
125 = 100*(((k/k+9)^1)/2) // - 100*(((k/k+9)^1)/2)
125-(100*(((k/k+9)^1)/2)) = 0
125-50*(k/k+9) = 0
125-50*10 = 0
125-50*10 = 0
-375 = 0
-375 = 0
k belongs to the empty set
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