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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
180*n-360 = (180*n-360)/n // - (180*n-360)/n
180*n-((180*n-360)/n)-360 = 0
(-1*(180*n-360))/n+180*n-360 = 0
(-1*(180*n-360))/n+(180*n*n)/n+(-360*n)/n = 0
180*n*n-1*(180*n-360)-360*n = 0
180*n^2-180*n-360*n+360 = 0
180*n^2-540*n+360 = 0
180*n^2-540*n+360 = 0
180*(n^2-3*n+2) = 0
n^2-3*n+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
n = (1^(1/2)+3)/(1*2) or n = (3-1^(1/2))/(1*2)
n = 2 or n = 1
180*(n-1)*(n-2) = 0
(180*(n-1)*(n-2))/n = 0
(180*(n-1)*(n-2))/n = 0 // * n
180*(n-1)*(n-2) = 0
( n-1 )
n-1 = 0 // + 1
n = 1
( n-2 )
n-2 = 0 // + 2
n = 2
n in { 1, 2 }
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