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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4/t-1 = (3*t)/t-1 // - (3*t)/t-1
4/t-((3*t)/t)-1+1 = 0
4/t-3-1+1 = 0
4*t^-1 = 3 // : 4
t^-1 = 3/4
-1 < 0
1/(t^1) = 3/4 // * t^1
1 = 3/4*t^1 // : 3/4
4/3 = t^1
t = 4/3
t = 4/3
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