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