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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^1)/3-(((1/4)*x^-1)/3))^2 = 0
(x/3+(-1/12)*x^-1)^2 = 0
(1/3*x-1/12*x^-1)^2 = 0
1/3*x-1/12*x^-1 = 0
1/3*x^-1*(x^2-1/4) = 0
1*x^2 = 1/4 // : 1
x^2 = 1/4
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
1/3*x^-1*(x-1/2)*(x+1/2) = 0
(1/3*x^-1)^2*(x-1/2)^2*(x+1/2)^2 = 0
( 1/3*x^-1 )
1/3*x^-1 = 0 // : 1/3
x^-1 = 0
x należy do O
( x+1/2 )
x+1/2 = 0 // - 1/2
x = -1/2
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
x in { -1/2, -1/2, 1/2, 1/2 }
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