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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(1/3)/3 = 6/t // - 6/t
(1/3)/3-(6/t) = 0
(1/3)/3-6*t^-1 = 0
-6*t^-1 = -1/9 // : -6
t^-1 = 1/54
-1 < 0
1/(t^1) = 1/54 // * t^1
1 = 1/54*t^1 // : 1/54
54 = t^1
t = 54
t = 54
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