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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t-((2*(3/t))/t) = 0
t-6*t^-2 = 0
t-6*t^-2 = 0
t*(1-6*t^-3) = 0
-6*t^-3 = -1 // : -6
t^-3 = 1/6
-3 < 0
1/(t^3) = 1/6 // * t^3
1 = 1/6*t^3 // : 1/6
6 = t^3
t^3 = 6 // ^ 1/3
t = 6^(1/3)
t = 0
t = 0
t in { 0}
t = 6^(1/3)
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