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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t^(-2/3) = 3 // - 3
t^(-2/3)-3 = 0
1*t^(-2/3) = 3 // : 1
t^(-2/3) = 3
-2/3 < 0
1/(t^(2/3)) = 3 // * t^(2/3)
1 = 3*t^(2/3) // : 3
1/3 = t^(2/3)
t^(2/3) = 1/3 // ^ 3
t^2 = 1/27 // ^ 1/2
abs(t) = (1/27)^(1/2)
t = (1/27)^(1/2) or t = -(1/27)^(1/2)
t in { (1/27)^(1/2), -(1/27)^(1/2) }
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