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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
60/240 = 1.5/n // - 1.5/n
60/240-(1.5/n) = 0
60/240-1.5*n^-1 = 0
-1.5*n^-1 = -1/4 // : -1.5
n^-1 = 0.16666667
-1 < 0
1/(n^1) = 0.16666667 // * n^1
1 = 0.16666667*n^1 // : 0.16666667
5.99999988 = n^1
n = 5.99999988
n = 5.99999988
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