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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(2.5^1)/t = 1.04 // - 1.04
(2.5^1)/t-1.04 = 0
2.5/t-1.04 = 0
2.5*t^-1 = 1.04 // : 2.5
t^-1 = 0.416
-1 < 0
1/(t^1) = 0.416 // * t^1
1 = 0.416*t^1 // : 0.416
2.40384615 = t^1
t = 2.40384615
t = 2.40384615
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