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D( x )
x < 0
x < 0
x in <0:+oo)
x^(1/4) = -3 // + 3
x^(1/4)+3 = 0
1*x^(1/4) = -3 // : 1
x^(1/4) = -3
( -3 < 0 i 1/4 in (0:1) ) => x należy do O
x belongs to the empty set
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