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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1*x = 1252/x // - 1252/x
0.1*x-(1252/x) = 0
0.1*x-1252*x^-1 = 0
0.1*x-1252*x^-1 = 0
x^-1*(0.1*x^2-1252) = 0
0.1*x^2 = 1252 // : 0.1
x^2 = 12520
x^2 = 12520 // ^ 1/2
abs(x) = 2*3130^(1/2)
x = 2*3130^(1/2) or x = -(2*3130^(1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 2*3130^(1/2), -(2*3130^(1/2)) }
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