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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5*t+(1/6)*t+3*t-((12*(3/9))/t)+1 = 0
5*t+(1/6)*t+3*t-4*t^-1+1 = 0
49/6*t^1-4*t^-1+1*t^0 = 0
(49/6*t^2+1*t^1-4*t^0)/(t^1) = 0 // * t^2
t^1*(49/6*t^2+1*t^1-4*t^0) = 0
t^1
(49/6)*t^2+t-4 = 0
(49/6)*t^2+t-4 = 0
DELTA = 1^2-(-4*4*(49/6))
DELTA = 395/3
DELTA > 0
t = ((395/3)^(1/2)-1)/(2*(49/6)) or t = (-(395/3)^(1/2)-1)/(2*(49/6))
t = 3/49*((395/3)^(1/2)-1) or t = -3/49*((395/3)^(1/2)+1)
t in { -3/49*((395/3)^(1/2)+1), 3/49*((395/3)^(1/2)-1)}
t in { -3/49*((395/3)^(1/2)+1), 3/49*((395/3)^(1/2)-1) }
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