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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 60 // - 60
(180*(n-2))/n-60 = 0
(180*(n-2))/n+(-60*n)/n = 0
180*(n-2)-60*n = 0
120*n-360 = 0
(120*n-360)/n = 0
(120*n-360)/n = 0 // * n
120*n-360 = 0
120*n-360 = 0 // + 360
120*n = 360 // : 120
n = 360/120
n = 3
n = 3
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