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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 1080 // - 1080
(180*(n-2))/n-1080 = 0
(180*(n-2))/n+(-1080*n)/n = 0
180*(n-2)-1080*n = 0
-900*n-360 = 0
(-900*n-360)/n = 0
(-900*n-360)/n = 0 // * n
-900*n-360 = 0
-900*n-360 = 0 // + 360
-900*n = 360 // : -900
n = 360/(-900)
n = -2/5
n = -2/5
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