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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1360/x = x/1360-x // - x/1360-x
x-(x/1360)+1360/x = 0
1359/1360*x^1+1360*x^-1 = 0
(1359/1360*x^2+1360*x^0)/(x^1) = 0 // * x^2
x^1*(1359/1360*x^2+1360*x^0) = 0
x^1
(1359/1360)*x^2+1360 = 0
(1359/1360)*x^2+1360 = 0
DELTA = 0^2-(4*1360*(1359/1360))
DELTA = -5436
DELTA < 0
x in { }
x belongs to the empty set
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