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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1.6/3.2 = 2.8/t // - 2.8/t
1.6/3.2-(2.8/t) = 0
1.6/3.2-2.8*t^-1 = 0
-2.8*t^-1 = -0.5 // : -2.8
t^-1 = 0.17857143
-1 < 0
1/(t^1) = 0.17857143 // * t^1
1 = 0.17857143*t^1 // : 0.17857143
5.59999996 = t^1
t = 5.59999996
t = 5.59999996
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