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D( b )
b^(1/3)-1 = 0
b^(1/3)-1 = 0
b^(1/3)-1 = 0
1*b^(1/3) = 1 // : 1
b^(1/3) = 1
b^(1/3) = 1 // ^ 3
b = 1
b in (-oo:1) U (1:+oo)
(b-b^(1/3))/(b^(1/3)-1) = 0
b-b^(1/3) = 0
b^(1/3)*(b^(2/3)-1) = 0
1*b^(2/3) = 1 // : 1
b^(2/3) = 1
b^(2/3) = 1 // ^ 3
b^2 = 1 // ^ 1/2
abs(b) = 1
b = 1 or b = -1
b^(1/3)*(b-1)*(b+1) = 0
(b^(1/3)*(b-1)*(b+1))/(b^(1/3)-1) = 0
( b+1 )
b+1 = 0 // - 1
b = -1
( b-1 )
b-1 = 0 // + 1
b = 1
( b^(1/3) )
1*b^(1/3) = 0 // : 1
b^(1/3) = 0
b = 0
b in { 1}
b in { -1, 0 }
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