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D( b )
4*b^2 = 0
4*b^2 = 0
4*b^2 = 0
4*b^2 = 0 // : 4
b^2 = 0
b = 0
b in (-oo:0) U (0:+oo)
(20*b^4-(24*b^2))/(4*b^2) = 0
(20*b^4-24*b^2)/(4*b^2) = 0
20*b^4-24*b^2 = 0
4*b^2*(5*b^2-6) = 0
5*b^2 = 6 // : 5
b^2 = 6/5
b^2 = 6/5 // ^ 1/2
abs(b) = (6/5)^(1/2)
b = (6/5)^(1/2) or b = -(6/5)^(1/2)
4*b^2*(b-(6/5)^(1/2))*(b+(6/5)^(1/2)) = 0
(b-(6/5)^(1/2))*(b+(6/5)^(1/2)) = 0
( b+(6/5)^(1/2) )
b+(6/5)^(1/2) = 0 // - (6/5)^(1/2)
b = -(6/5)^(1/2)
( b-(6/5)^(1/2) )
b-(6/5)^(1/2) = 0 // + (6/5)^(1/2)
b = (6/5)^(1/2)
b in { -(6/5)^(1/2), (6/5)^(1/2) }
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