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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1500 = 600/t // - 600/t
1500-(600/t) = 0
1500-600*t^-1 = 0
-600*t^-1 = -1500 // : -600
t^-1 = 5/2
-1 < 0
1/(t^1) = 5/2 // * t^1
1 = 5/2*t^1 // : 5/2
2/5 = t^1
t = 2/5
t = 2/5
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