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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9 = 4/t // - 4/t
9-(4/t) = 0
9-4*t^-1 = 0
-4*t^-1 = -9 // : -4
t^-1 = 9/4
-1 < 0
1/(t^1) = 9/4 // * t^1
1 = 9/4*t^1 // : 9/4
4/9 = t^1
t = 4/9
t = 4/9
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