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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
36/t = 6 // - 6
36/t-6 = 0
36*t^-1 = 6 // : 36
t^-1 = 1/6
-1 < 0
1/(t^1) = 1/6 // * t^1
1 = 1/6*t^1 // : 1/6
6 = t^1
t = 6
t = 6
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