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