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