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D( t )
t^8 = 0
t^8 = 0
t^8 = 0
1*t^8 = 0 // : 1
t^8 = 0
t = 0
t in (-oo:0) U (0:+oo)
(t^5)/(t^8) = 0
1*t^-3 = 0 // : 1
t^-3 = 0
t naleu017Cy do O
t belongs to the empty set
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