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D( b )
2*b = 0
2*b = 0
2*b = 0
2*b = 0 // : 2
b = 0
b in (-oo:0) U (0:+oo)
(b^2-(12*b)+5)/(2*b) = 0
(b^2-12*b+5)/(2*b) = 0
b^2-12*b+5 = 0
b^2-12*b+5 = 0
DELTA = (-12)^2-(1*4*5)
DELTA = 124
DELTA > 0
b = (124^(1/2)+12)/(1*2) or b = (12-124^(1/2))/(1*2)
b = (2*31^(1/2)+12)/2 or b = (12-2*31^(1/2))/2
(b-((12-2*31^(1/2))/2))*(b-((2*31^(1/2)+12)/2)) = 0
((b-((12-2*31^(1/2))/2))*(b-((2*31^(1/2)+12)/2)))/(2*b) = 0
( b-((12-2*31^(1/2))/2) )
b-((12-2*31^(1/2))/2) = 0 // + (12-2*31^(1/2))/2
b = (12-2*31^(1/2))/2
( b-((2*31^(1/2)+12)/2) )
b-((2*31^(1/2)+12)/2) = 0 // + (2*31^(1/2)+12)/2
b = (2*31^(1/2)+12)/2
b in { (12-2*31^(1/2))/2, (2*31^(1/2)+12)/2 }
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