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D( x )
x < 0
x = 0
x^(1/4) = 0
x < 0
x = 0
x = 0
x^(1/4) = 0
x^(1/4) = 0
1*x^(1/4) = 0 // : 1
x^(1/4) = 0
x = 0
x in (0:+oo)
(9*x^-1)/(x^(1/4)) = 0
9*x^(-5/4) = 0 // : 9
x^(-5/4) = 0
x należy do O
x belongs to the empty set
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