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D( d )
d < 0
d < 0
d in <0:+oo)
4 = (1/4)*d^(1/2) // - (1/4)*d^(1/2)
4-((1/4)*d^(1/2)) = 0
(-1/4)*d^(1/2)+4 = 0
-1/4*d^(1/2) = -4 // : -1/4
d^(1/2) = 16
( 16 < 0 i 1/2 in (0:1) ) => d naleu017Cy do O
d belongs to the empty set
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