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D( t )
t^2 = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t in (-oo:0) U (0:+oo)
(5/3)*t-(4/(t^2)) = 0
(5/3)*t-4*t^-2 = 0
5/3*t-4*t^-2 = 0
t*(5/3-4*t^-3) = 0
-4*t^-3 = -5/3 // : -4
t^-3 = 5/12
-3 < 0
1/(t^3) = 5/12 // * t^3
1 = 5/12*t^3 // : 5/12
12/5 = t^3
t^3 = 12/5 // ^ 1/3
t = (12/5)^(1/3)
t = 0
t = 0
t in { 0}
t = (12/5)^(1/3)
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