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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(t^-1)/2 = 8 // - 8
(t^-1)/2-8 = 0
1/2*t^-1 = 8 // : 1/2
t^-1 = 16
-1 < 0
1/(t^1) = 16 // * t^1
1 = 16*t^1 // : 16
1/16 = t^1
t = 1/16
t = 1/16
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