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D( b )
b^2 = 0
b^2 = 0
b^2 = 0
1*b^2 = 0 // : 1
b^2 = 0
b = 0
b in (-oo:0) U (0:+oo)
(2*(b^3-8000))/(b^2) = 0
1*b^3 = 8000 // : 1
b^3 = 8000
b^3 = 8000 // ^ 1/3
b = 20
b = 20
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