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