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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
48/72 = 9/t // - 9/t
48/72-(9/t) = 0
48/72-9*t^-1 = 0
-9*t^-1 = -2/3 // : -9
t^-1 = 2/27
-1 < 0
1/(t^1) = 2/27 // * t^1
1 = 2/27*t^1 // : 2/27
27/2 = t^1
t = 27/2
t = 27/2
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