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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
e^1.8 = 1.1/t // - 1.1/t
e^1.8-(1.1/t) = 0
e^1.8-1.1*t^-1 = 0
-1.1*t^-1 = -e^1.8 // : -1.1
t^-1 = 0.90909091*e^1.8
-1 < 0
1/(t^1) = 0.90909091*e^1.8 // * t^1
1 = 0.90909091*e^1.8*t^1 // : 0.90909091*e^1.8
1.1*e^-1.8 = t^1
t = 1.1*e^-1.8
t = 1.1*e^-1.8
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