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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2/24 = 9/t // - 9/t
2/24-(9/t) = 0
2/24-9*t^-1 = 0
-9*t^-1 = -1/12 // : -9
t^-1 = 1/108
-1 < 0
1/(t^1) = 1/108 // * t^1
1 = 1/108*t^1 // : 1/108
108 = t^1
t = 108
t = 108
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