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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x-(3/x))^2 = 0
(3*x-3*x^-1)^2 = 0
3*x-3*x^-1 = 0
3*x^-1*(x^2-1) = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
3*x^-1*(x-1)*(x+1) = 0
(3*x^-1)^2*(x-1)^2*(x+1)^2 = 0
( 3*x^-1 )
3*x^-1 = 0 // : 3
x^-1 = 0
x należy do O
( x+1 )
x+1 = 0 // - 1
x = -1
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -1, -1, 1, 1 }
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