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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n-((2*180)/n) = 165 // - 165
n-((2*180)/n)-165 = 0
n-360*n^-1-165 = 0
1*n^1-360*n^-1-165*n^0 = 0
(1*n^2-165*n^1-360*n^0)/(n^1) = 0 // * n^2
n^1*(1*n^2-165*n^1-360*n^0) = 0
n^1
n^2-165*n-360 = 0
n^2-165*n-360 = 0
DELTA = (-165)^2-(-360*1*4)
DELTA = 28665
DELTA > 0
n = (28665^(1/2)+165)/(1*2) or n = (165-28665^(1/2))/(1*2)
n = (21*65^(1/2)+165)/2 or n = (165-21*65^(1/2))/2
n in { (165-21*65^(1/2))/2, (21*65^(1/2)+165)/2}
n in { (165-21*65^(1/2))/2, (21*65^(1/2)+165)/2 }
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