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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-((1/3.8)*x) = 0
1/x-0.26315789*x = 0
x^-1-0.26315789*x = 0
x^-1*(1-0.26315789*x^2) = 0
-0.26315789*x^2 = -1 // : -0.26315789
x^2 = 3.80000007
x^2 = 3.80000007 // ^ 1/2
abs(x) = 3.80000007^(1/2)
x = 3.80000007^(1/2) or x = -3.80000007^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 3.80000007^(1/2), -3.80000007^(1/2) }
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