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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1/t = 5/3 // - 5/3
1/t-(5/3) = 0
1/t-5/3 = 0
1*t^-1 = 5/3 // : 1
t^-1 = 5/3
-1 < 0
1/(t^1) = 5/3 // * t^1
1 = 5/3*t^1 // : 5/3
3/5 = t^1
t = 3/5
t = 3/5
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