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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
11/t = 4/5 // - 4/5
11/t-(4/5) = 0
11/t-4/5 = 0
11*t^-1 = 4/5 // : 11
t^-1 = 4/55
-1 < 0
1/(t^1) = 4/55 // * t^1
1 = 4/55*t^1 // : 4/55
55/4 = t^1
t = 55/4
t = 55/4
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