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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5*x = 4/x // - 4/x
1.5*x-(4/x) = 0
1.5*x-4*x^-1 = 0
1.5*x-4*x^-1 = 0
x^-1*(1.5*x^2-4) = 0
1.5*x^2 = 4 // : 1.5
x^2 = 2.66666667
x^2 = 2.66666667 // ^ 1/2
abs(x) = 2.66666667^(1/2)
x = 2.66666667^(1/2) or x = -2.66666667^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 2.66666667^(1/2), -2.66666667^(1/2) }
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