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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
10/1.8 = 25/t // - 25/t
10/1.8-(25/t) = 0
10/1.8-25*t^-1 = 0
-25*t^-1 = -5.55555556 // : -25
t^-1 = 0.22222222
-1 < 0
1/(t^1) = 0.22222222 // * t^1
1 = 0.22222222*t^1 // : 0.22222222
4.50000005 = t^1
t = 4.50000005
t = 4.50000005
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