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