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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5/t = 0.5/0.3 // - 0.5/0.3
5/t-(0.5/0.3) = 0
5/t-1.66666667 = 0
5*t^-1 = 1.66666667 // : 5
t^-1 = 0.33333333
-1 < 0
1/(t^1) = 0.33333333 // * t^1
1 = 0.33333333*t^1 // : 0.33333333
3.00000003 = t^1
t = 3.00000003
t = 3.00000003
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