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D( n )
n = 0
n < 0
n = 0
n = 0
n < 0
n in (0:+oo)
n^(-5/2)*n^(9/2) = 0
1*n^2 = 0 // : 1
n^2 = 0
n = 0
n in { 0}
n belongs to the empty set
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