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