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