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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2*e^8*t+2*e^-8*t+1/t = 0
(2*e^-8+2*e^8)*t+t^-1 = 0
t^-1*((2*e^-8+2*e^8)*t^2+1) = 0
(2*e^-8+2*e^8)*t^2 = -1 // : 2*e^-8+2*e^8
t^2 = -1/(2*e^-8+2*e^8)
1/t = 0
1*t^-1 = 0 // : 1
t^-1 = 0
t naleu017Cy do O
t belongs to the empty set
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