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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x^(-1/3)-(2*x) = 0
(2/3)*x^(-1/3)-2*x = 0
2/3*x^(-1/3)-2*x = 0
t_1 = x^(1/3)
2/3*t_1^-1-2*t_1^3 = 0
2*t_1^-1*(1/3-t_1^4) = 0
-1*t_1^4 = -1/3 // : -1
t_1^4 = 1/3
t_1^4 = 1/3 // ^ 1/4
abs(t_1) = (1/3)^(1/4)
t_1 = (1/3)^(1/4) or t_1 = -(1/3)^(1/4)
2/t_1 = 0
2*t_1^-1 = 0 // : 2
t_1^-1 = 0
t_1 należy do O
t_1 = (1/3)^(1/4)
x^(1/3)-(1/3)^(1/4) = 0
1*x^(1/3) = (1/3)^(1/4) // : 1
x^(1/3) = (1/3)^(1/4)
x^(1/3) = (1/3)^(1/4) // ^ 3
x = (1/3)^(3/4)
t_1 = -(1/3)^(1/4)
x^(1/3)+(1/3)^(1/4) = 0
1*x^(1/3) = -(1/3)^(1/4) // : 1
x^(1/3) = -(1/3)^(1/4)
( -(1/3)^(1/4) < 0 i 1/3 in (0:1) ) => x należy do O
x = (1/3)^(3/4)
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