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D( b )
4*b^5 < 0
(4*b^5)^(3/2) = 0
4*b^5 < 0
4*b^5 < 0
4*b^5 < 0
4*b^5 < 0 // : 4
b^5 < 0/4
b^5 < 0
b^5 < 0 // ^ 1/5
b < 0
b in (-oo:0)
(4*b^5)^(3/2) = 0
(4*b^5)^(3/2) = 0
8*b^(15/2) = 0 // : 8
b^(15/2) = 0
b = 0
b in (0:+oo)
((8*b^4)^(5/3))/((4*b^5)^(3/2)) = 0
4*b^(-5/6) = 0 // : 4
b^(-5/6) = 0
b należy do O
b belongs to the empty set
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