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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
32 = 4000/t // - 4000/t
32-(4000/t) = 0
32-4000*t^-1 = 0
-4000*t^-1 = -32 // : -4000
t^-1 = 1/125
-1 < 0
1/(t^1) = 1/125 // * t^1
1 = 1/125*t^1 // : 1/125
125 = t^1
t = 125
t = 125
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