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