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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(6/3)*t-4 = 6/t // - 6/t
(6/3)*t-(6/t)-4 = 0
(6/3)*t-6*t^-1-4 = 0
2*t^1-6*t^-1-4*t^0 = 0
(2*t^2-4*t^1-6*t^0)/(t^1) = 0 // * t^2
t^1*(2*t^2-4*t^1-6*t^0) = 0
t^1
2*t^2-4*t-6 = 0
2*t^2-4*t-6 = 0
DELTA = (-4)^2-(-6*2*4)
DELTA = 64
DELTA > 0
t = (64^(1/2)+4)/(2*2) or t = (4-64^(1/2))/(2*2)
t = 3 or t = -1
t in { -1, 3}
t in { -1, 3 }
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