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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/t = 9/5 // - 9/5
3/t-(9/5) = 0
3/t-9/5 = 0
3*t^-1 = 9/5 // : 3
t^-1 = 3/5
-1 < 0
1/(t^1) = 3/5 // * t^1
1 = 3/5*t^1 // : 3/5
5/3 = t^1
t = 5/3
t = 5/3
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