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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5*t-(10/t)-(5/t)-(2/2) = 0
5*t-10*t^-1-5*t^-1-1 = 0
5*t^1-15*t^-1-1*t^0 = 0
(5*t^2-1*t^1-15*t^0)/(t^1) = 0 // * t^2
t^1*(5*t^2-1*t^1-15*t^0) = 0
t^1
5*t^2-t-15 = 0
5*t^2-t-15 = 0
DELTA = (-1)^2-(-15*4*5)
DELTA = 301
DELTA > 0
t = (301^(1/2)+1)/(2*5) or t = (1-301^(1/2))/(2*5)
t = (301^(1/2)+1)/10 or t = (1-301^(1/2))/10
t in { (1-301^(1/2))/10, (301^(1/2)+1)/10}
t in { (1-301^(1/2))/10, (301^(1/2)+1)/10 }
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