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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
150 = (180*(n-2))/n // - (180*(n-2))/n
150-((180*(n-2))/n) = 0
150-180*n^-1*(n-2) = 0
150-180*n^-1*(n-2) = 0
360*n^-1-30 = 0
360*n^-1-30 = 0
360*n^-1 = 30 // : 360
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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