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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 2.86 // - 2.86
4/n-2.86 = 0
4*n^-1 = 2.86 // : 4
n^-1 = 0.715
-1 < 0
1/(n^1) = 0.715 // * n^1
1 = 0.715*n^1 // : 0.715
1.3986014 = n^1
n = 1.3986014
n = 1.3986014
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