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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
60/90 = 180/n // - 180/n
60/90-(180/n) = 0
60/90-180*n^-1 = 0
-180*n^-1 = -2/3 // : -180
n^-1 = 1/270
-1 < 0
1/(n^1) = 1/270 // * n^1
1 = 1/270*n^1 // : 1/270
270 = n^1
n = 270
n = 270
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