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