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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/32 = 1/n // - 1/n
16/32-(1/n) = 0
16/32-n^-1 = 0
-1*n^-1 = -1/2 // : -1
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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