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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
20/3 = 13.6/t // - 13.6/t
20/3-(13.6/t) = 0
20/3-13.6*t^-1 = 0
-13.6*t^-1 = -20/3 // : -13.6
t^-1 = 0.49019608
-1 < 0
1/(t^1) = 0.49019608 // * t^1
1 = 0.49019608*t^1 // : 0.49019608
2.03999999 = t^1
t = 2.03999999
t = 2.03999999
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