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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/8 = 9/t // - 9/t
3/8-(9/t) = 0
3/8-9*t^-1 = 0
-9*t^-1 = -3/8 // : -9
t^-1 = 1/24
-1 < 0
1/(t^1) = 1/24 // * t^1
1 = 1/24*t^1 // : 1/24
24 = t^1
t = 24
t = 24
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