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D( b )
5*b^2 = 0
36*b = 0
5*b^2 = 0
5*b^2 = 0
5*b^2 = 0 // : 5
b^2 = 0
b = 0
36*b = 0
36*b = 0
36*b = 0 // : 36
b = 0
b in (-oo:0) U (0:+oo)
(25*((-6*b^6)/(5*b^2))*b^4)/(36*b) = 0
-5/6*b^7 = 0 // : -5/6
b^7 = 0
b = 0
b in { 0}
b belongs to the empty set
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