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D( b )
(4*b^1)/2 = 0
(4*b^1)/2 = 0
(4*b^1)/2 = 0
(4*b)/2 = 0
2*b = 0 // : 2
b = 0
b in (-oo:0) U (0:+oo)
((20*b^4)/5)/((4*b^1)/2) = 0
((20*b^4)/5)/((4*b)/2) = 0
2*b^3 = 0 // : 2
b^3 = 0
b = 0
b in { 0}
b belongs to the empty set
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