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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9/3 = 36/t // - 36/t
9/3-(36/t) = 0
9/3-36*t^-1 = 0
-36*t^-1 = -3 // : -36
t^-1 = 1/12
-1 < 0
1/(t^1) = 1/12 // * t^1
1 = 1/12*t^1 // : 1/12
12 = t^1
t = 12
t = 12
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