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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
180*n-(360/n) = 135 // - 135
180*n-(360/n)-135 = 0
180*n-360*n^-1-135 = 0
180*n^1-360*n^-1-135*n^0 = 0
(180*n^2-135*n^1-360*n^0)/(n^1) = 0 // * n^2
n^1*(180*n^2-135*n^1-360*n^0) = 0
n^1
180*n^2-135*n-360 = 0
180*n^2-135*n-360 = 0
DELTA = (-135)^2-(-360*4*180)
DELTA = 277425
DELTA > 0
n = (277425^(1/2)+135)/(2*180) or n = (135-277425^(1/2))/(2*180)
n = (45*137^(1/2)+135)/360 or n = (135-45*137^(1/2))/360
n in { (135-45*137^(1/2))/360, (45*137^(1/2)+135)/360}
n in { (135-45*137^(1/2))/360, (45*137^(1/2)+135)/360 }
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