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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
e/n = 2 // - 2
e/n-2 = 0
e*n^-1 = 2 // : e
n^-1 = 2/e
-1 < 0
1/(n^1) = 2/e // * n^1
1 = (2/e)*n^1 // : 2/e
1/(2/e) = n^1
n = 1/(2/e)
n = 1/(2/e)
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