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D( t )
2*t-1 = 0
2*t-1 = 0
2*t-1 = 0
2*t-1 = 0 // + 1
2*t = 1 // : 2
t = 1/2
t in (-oo:1/2) U (1/2:+oo)
(4*t^3-(5*t)-1)/(2*t-1) = 0
(4*t^3-5*t-1)/(2*t-1) = 0
4*t^3-5*t-1 = 0
4*t^3-5*t-1 = 0
{ 1, -1 }
1
t = 1
4*t^3-5*t-1 = -2
1
-1
t = -1
4*t^3-5*t-1 = 0
-1
t+1
4*t^2-4*t-1
4*t^3-5*t-1
t+1
-4*t^3-4*t^2
-4*t^2-5*t-1
4*t^2+4*t
-t-1
t+1
0
4*t^2-4*t-1 = 0
DELTA = (-4)^2-(-1*4*4)
DELTA = 32
DELTA > 0
t = (32^(1/2)+4)/(2*4) or t = (4-32^(1/2))/(2*4)
t = (4*2^(1/2)+4)/8 or t = (4-4*2^(1/2))/8
t in { (4-4*2^(1/2))/8, (4*2^(1/2)+4)/8, -1}
(t-((4-4*2^(1/2))/8))*(t-((4*2^(1/2)+4)/8))*(t+1) = 0
((t-((4-4*2^(1/2))/8))*(t-((4*2^(1/2)+4)/8))*(t+1))/(2*t-1) = 0
( t+1 )
t+1 = 0 // - 1
t = -1
( t-((4*2^(1/2)+4)/8) )
t-((4*2^(1/2)+4)/8) = 0 // + (4*2^(1/2)+4)/8
t = (4*2^(1/2)+4)/8
( t-((4-4*2^(1/2))/8) )
t-((4-4*2^(1/2))/8) = 0 // + (4-4*2^(1/2))/8
t = (4-4*2^(1/2))/8
t in { -1, (4*2^(1/2)+4)/8, (4-4*2^(1/2))/8 }
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