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D( n )
n < 0
3*n^(1/2) = 0
n < 0
3*n^(1/2) = 0
3*n^(1/2) = 0
3*n^(1/2) = 0 // : 3
n^(1/2) = 0
n = 0
n in (0:+oo)
(3*n^(1/2))^-6 = 0
1/729*n^-3 = 0 // : 1/729
n^-3 = 0
n należy do O
n belongs to the empty set
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