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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
L = 1000/x // - 1000/x
L-(1000/x) = 0
L-1000*x^-1 = 0
-1000*x^-1 = -L // : -1000
x^-1 = L/1000
-1 < 0
1/(x^1) = L/1000 // * x^1
1 = (L/1000)*x^1 // : L/1000
1000*L^-1 = x^1
x = 1000*L^-1
x = 1000*L^-1
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