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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*n-360)/n = 144 // - 144
(180*n-360)/n-144 = 0
(180*n-360)/n+(-144*n)/n = 0
180*n-144*n-360 = 0
36*n-360 = 0
(36*n-360)/n = 0
(36*n-360)/n = 0 // * n
36*n-360 = 0
36*n-360 = 0 // + 360
36*n = 360 // : 36
n = 360/36
n = 10
n = 10
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