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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
18 = 360/n // - 360/n
18-(360/n) = 0
18-360*n^-1 = 0
-360*n^-1 = -18 // : -360
n^-1 = 1/20
-1 < 0
1/(n^1) = 1/20 // * n^1
1 = 1/20*n^1 // : 1/20
20 = n^1
n = 20
n = 20
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