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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.02*x // - 0.02*x
1/x-(0.02*x) = 0
1/x-0.02*x = 0
x^-1-0.02*x = 0
x^-1*(1-0.02*x^2) = 0
-0.02*x^2 = -1 // : -0.02
x^2 = 50
x^2 = 50 // ^ 1/2
abs(x) = 5*2^(1/2)
x = 5*2^(1/2) or x = -(5*2^(1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 5*2^(1/2), -(5*2^(1/2)) }
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