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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 180 // - 180
(180*(n-2))/n-180 = 0
(180*(n-2))/n+(-180*n)/n = 0
180*(n-2)-180*n = 0
-360 = 0
-360/n = 0
-360/n = 0 // * n
-360 = 0
n belongs to the empty set
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