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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8/t = 5/6 // - 5/6
8/t-(5/6) = 0
8/t-5/6 = 0
8*t^-1 = 5/6 // : 8
t^-1 = 5/48
-1 < 0
1/(t^1) = 5/48 // * t^1
1 = 5/48*t^1 // : 5/48
48/5 = t^1
t = 48/5
t = 48/5
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