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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n > 179 // - 179
(180*(n-2))/n-179 > 0
(180*(n-2))/n+(-179*n)/n > 0
180*(n-2)-179*n > 0
n-360 > 0
(n-360)/n > 0
(n-360)/n > 0 // * n^2
n*(n-360) > 0
( n-360 )
n-360 > 0 // + 360
n > 360
( n )
n+0 > 0 // - 0
n > 0
(-oo:0) (0:360) (360:+oo) n-360 - - + n - + +
n in (-oo:0) U (360:+oo)
(-oo:0) U (360:+oo)
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