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D( x )
3*x^(4/3) = 0
3*x^(4/3) = 0
3*x^(4/3) = 0
3*x^(4/3) = 0 // : 3
x^(4/3) = 0
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x^(4/3)) = 0
2/3*x^(-4/3) = 0 // : 2/3
x^(-4/3) = 0
x należy do O
x belongs to the empty set
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