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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
180*(n-2) = 360/n // - 360/n
180*(n-2)-(360/n) = 0
180*(n-2)-360*n^-1 = 0
180*(n-2)-360/n = 0
(180*n*(n-2))/n-360/n = 0
180*n*(n-2)-360 = 0
180*n^2-360*n-360 = 0
180*n^2-360*n-360 = 0
180*(n^2-2*n-2) = 0
n^2-2*n-2 = 0
DELTA = (-2)^2-(-2*1*4)
DELTA = 12
DELTA > 0
n = (12^(1/2)+2)/(1*2) or n = (2-12^(1/2))/(1*2)
n = (2*3^(1/2)+2)/2 or n = (2-2*3^(1/2))/2
180*(n-((2-2*3^(1/2))/2))*(n-((2*3^(1/2)+2)/2)) = 0
(180*(n-((2-2*3^(1/2))/2))*(n-((2*3^(1/2)+2)/2)))/n = 0
(180*(n-((2-2*3^(1/2))/2))*(n-((2*3^(1/2)+2)/2)))/n = 0 // * n
180*(n-((2-2*3^(1/2))/2))*(n-((2*3^(1/2)+2)/2)) = 0
( n-((2*3^(1/2)+2)/2) )
n-((2*3^(1/2)+2)/2) = 0 // + (2*3^(1/2)+2)/2
n = (2*3^(1/2)+2)/2
( n-((2-2*3^(1/2))/2) )
n-((2-2*3^(1/2))/2) = 0 // + (2-2*3^(1/2))/2
n = (2-2*3^(1/2))/2
n in { (2*3^(1/2)+2)/2, (2-2*3^(1/2))/2 }
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