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D( x )
x < 0
x < 0
x in <0:+oo)
4/(1^(1/2))-x^(1/2) = 0
4-x^(1/2) = 0
-1*x^(1/2) = -4 // : -1
x^(1/2) = 4
( 4 < 0 i 1/2 in (0:1) ) => x naleu017Cy do O
x belongs to the empty set
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