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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x^2-(1/x) = 0
4*x^2-x^-1 = 0
4*x^2-x^-1 = 0
x^-1*(4*x^3-1) = 0
4*x^3 = 1 // : 4
x^3 = 1/4
x^3 = 1/4 // ^ 1/3
x = (1/4)^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = (1/4)^(1/3)
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