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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
-5.2/t = -3.25 // + 3.25
3.25-5.2/t = 0
-5.2*t^-1 = -3.25 // : -5.2
t^-1 = 0.625
-1 < 0
1/(t^1) = 0.625 // * t^1
1 = 0.625*t^1 // : 0.625
1.6 = t^1
t = 1.6
t = 1.6
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