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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
10/1.6 = 8/t // - 8/t
10/1.6-(8/t) = 0
10/1.6-8*t^-1 = 0
-8*t^-1 = -6.25 // : -8
t^-1 = 0.78125
-1 < 0
1/(t^1) = 0.78125 // * t^1
1 = 0.78125*t^1 // : 0.78125
1.28 = t^1
t = 1.28
t = 1.28
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