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D( t )
t^1 = 0
t^1 = 0
t^1 = 0
t = 0
t in (-oo:0) U (0:+oo)
0.2666 = (t^1-298)/(t^1) // - (t^1-298)/(t^1)
0.2666-((t^1-298)/(t^1)) = 0
0.2666-((t-298)/t) = 0
(-1*(t-298))/t+0.2666 = 0
(-1*(t-298))/t+(0.2666*t)/t = 0
0.2666*t-1*(t-298) = 0
298-0.7334*t = 0
(298-0.7334*t)/t = 0
(298-0.7334*t)/t = 0 // * t
298-0.7334*t = 0
298-0.7334*t = 0 // - 298
-0.7334*t = -298 // : -0.7334
t = -298/(-0.7334)
t = 406.32669757
t = 406.32669757
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