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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/2 = 2/n // - 2/n
4/2-(2/n) = 0
4/2-2*n^-1 = 0
-2*n^-1 = -2 // : -2
n^-1 = 1
-1 < 0
1/(n^1) = 1 // * n^1
1 = 1*n^1 // : 1
1 = n^1
n = 1
n = 1
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