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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1.84/2.85 = 5.14/t // - 5.14/t
1.84/2.85-(5.14/t) = 0
1.84/2.85-5.14*t^-1 = 0
-5.14*t^-1 = -0.64561404 // : -5.14
t^-1 = 0.12560584
-1 < 0
1/(t^1) = 0.12560584 // * t^1
1 = 0.12560584*t^1 // : 0.12560584
7.96141326 = t^1
t = 7.96141326
t = 7.96141326
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