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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
32 = 96/t // - 96/t
32-(96/t) = 0
32-96*t^-1 = 0
-96*t^-1 = -32 // : -96
t^-1 = 1/3
-1 < 0
1/(t^1) = 1/3 // * t^1
1 = 1/3*t^1 // : 1/3
3 = t^1
t = 3
t = 3
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