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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
456/n = 4.56 // - 4.56
456/n-4.56 = 0
456*n^-1 = 4.56 // : 456
n^-1 = 0.01
-1 < 0
1/(n^1) = 0.01 // * n^1
1 = 0.01*n^1 // : 0.01
100 = n^1
n = 100
n = 100
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