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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6/1.6 = 9/t // - 9/t
6/1.6-(9/t) = 0
6/1.6-9*t^-1 = 0
-9*t^-1 = -3.75 // : -9
t^-1 = 0.41666667
-1 < 0
1/(t^1) = 0.41666667 // * t^1
1 = 0.41666667*t^1 // : 0.41666667
2.39999998 = t^1
t = 2.39999998
t = 2.39999998
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