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D( x )
x < 0
x < 0
x in <0:+oo)
x^(1/2) = -1 // + 1
x^(1/2)+1 = 0
1*x^(1/2) = -1 // : 1
x^(1/2) = -1
( -1 < 0 i 1/2 in (0:1) ) => x naleu017Cy do O
x belongs to the empty set
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