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