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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-((4/(b^2))*b^8) = 0
b-4*b^6 = 0
b-4*b^6 = 0
b*(1-4*b^5) = 0
-4*b^5 = -1 // : -4
b^5 = 1/4
b^5 = 1/4 // ^ 1/5
b = (1/4)^(1/5)
b = 0
b = 0
b in { 0}
b = (1/4)^(1/5)
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