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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
170 = (180*(n-2))/n // - (180*(n-2))/n
170-((180*(n-2))/n) = 0
170-180*n^-1*(n-2) = 0
170-180*n^-1*(n-2) = 0
360*n^-1-10 = 0
360*n^-1-10 = 0
360*n^-1 = 10 // : 360
n^-1 = 1/36
-1 < 0
1/(n^1) = 1/36 // * n^1
1 = 1/36*n^1 // : 1/36
36 = n^1
n = 36
n = 36
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