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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.2/0.6 = 3.6/n // - 3.6/n
1.2/0.6-(3.6/n) = 0
1.2/0.6-3.6*n^-1 = 0
-3.6*n^-1 = -2 // : -3.6
n^-1 = 0.55555556
-1 < 0
1/(n^1) = 0.55555556 // * n^1
1 = 0.55555556*n^1 // : 0.55555556
1.79999999 = n^1
n = 1.79999999
n = 1.79999999
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