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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
180*(n-2) = 160/n // - 160/n
180*(n-2)-(160/n) = 0
180*(n-2)-160*n^-1 = 0
180*(n-2)-160/n = 0
(180*n*(n-2))/n-160/n = 0
180*n*(n-2)-160 = 0
180*n^2-360*n-160 = 0
180*n^2-360*n-160 = 0
20*(9*n^2-18*n-8) = 0
9*n^2-18*n-8 = 0
DELTA = (-18)^2-(-8*4*9)
DELTA = 612
DELTA > 0
n = (612^(1/2)+18)/(2*9) or n = (18-612^(1/2))/(2*9)
n = (6*17^(1/2)+18)/18 or n = (18-6*17^(1/2))/18
20*(n-((18-6*17^(1/2))/18))*(n-((6*17^(1/2)+18)/18)) = 0
(20*(n-((18-6*17^(1/2))/18))*(n-((6*17^(1/2)+18)/18)))/n = 0
(20*(n-((18-6*17^(1/2))/18))*(n-((6*17^(1/2)+18)/18)))/n = 0 // * n
20*(n-((18-6*17^(1/2))/18))*(n-((6*17^(1/2)+18)/18)) = 0
( 20 )
20 = 0
n belongs to the empty set
( n-((18-6*17^(1/2))/18) )
n-((18-6*17^(1/2))/18) = 0 // + (18-6*17^(1/2))/18
n = (18-6*17^(1/2))/18
( n-((6*17^(1/2)+18)/18) )
n-((6*17^(1/2)+18)/18) = 0 // + (6*17^(1/2)+18)/18
n = (6*17^(1/2)+18)/18
n in { (18-6*17^(1/2))/18, (6*17^(1/2)+18)/18 }
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