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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(30/5)/6 = 180/n // - 180/n
(30/5)/6-(180/n) = 0
(30/5)/6-180*n^-1 = 0
-180*n^-1 = -1 // : -180
n^-1 = 1/180
-1 < 0
1/(n^1) = 1/180 // * n^1
1 = 1/180*n^1 // : 1/180
180 = n^1
n = 180
n = 180
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