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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)
(b^10)/(b^2) = b^5 // - b^5
(b^10)/(b^2)-b^5 = 0
b^8-b^5 = 0
b^5*(b^3-1) = 0
1*b^3 = 1 // : 1
b^3 = 1
b^3 = 1 // ^ 1/3
b = 1
b^5 = 0
1*b^5 = 0 // : 1
b^5 = 0
b = 0
b in { 0}
b = 1
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