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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
18/t = 9 // - 9
18/t-9 = 0
18*t^-1 = 9 // : 18
t^-1 = 1/2
-1 < 0
1/(t^1) = 1/2 // * t^1
1 = 1/2*t^1 // : 1/2
2 = t^1
t = 2
t = 2
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