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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
26/288 = 13/t // - 13/t
26/288-(13/t) = 0
26/288-13*t^-1 = 0
-13*t^-1 = -13/144 // : -13
t^-1 = 1/144
-1 < 0
1/(t^1) = 1/144 // * t^1
1 = 1/144*t^1 // : 1/144
144 = t^1
t = 144
t = 144
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