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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(8/n)/n = 2 // - 2
(8/n)/n-2 = 0
8*n^-2 = 2 // : 8
n^-2 = 1/4
-2 < 0
1/(n^2) = 1/4 // * n^2
1 = 1/4*n^2 // : 1/4
4 = n^2
n^2 = 4 // ^ 1/2
abs(n) = 2
n = 2 or n = -2
n in { 2, -2 }
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