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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 179 // - 179
(180*(n-2))/n-179 = 0
(180*(n-2))/n+(-179*n)/n = 0
180*(n-2)-179*n = 0
n-360 = 0
(n-360)/n = 0
(n-360)/n = 0 // * n
n-360 = 0
n-360 = 0 // + 360
n = 360
n = 360
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