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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
360/n = 90 // - 90
360/n-90 = 0
360*n^-1 = 90 // : 360
n^-1 = 1/4
-1 < 0
1/(n^1) = 1/4 // * n^1
1 = 1/4*n^1 // : 1/4
4 = n^1
n = 4
n = 4
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