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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
38/3 = 190/t // - 190/t
38/3-(190/t) = 0
38/3-190*t^-1 = 0
-190*t^-1 = -38/3 // : -190
t^-1 = 1/15
-1 < 0
1/(t^1) = 1/15 // * t^1
1 = 1/15*t^1 // : 1/15
15 = t^1
t = 15
t = 15
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