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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
783/t = 348/232 // - 348/232
783/t-(348/232) = 0
783/t-3/2 = 0
783*t^-1 = 3/2 // : 783
t^-1 = 1/522
-1 < 0
1/(t^1) = 1/522 // * t^1
1 = 1/522*t^1 // : 1/522
522 = t^1
t = 522
t = 522
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