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D( t )
2^1.2*t = 0
2^1.2*t = 0
2^1.2*t = 0
2^1.2*t = 0 // : 2^1.2
t = 0
t in (-oo:0) U (0:+oo)
(2^2.2*t)/(2^1.2*t) = 3 // - 3
(2^2.2*t)/(2^1.2*t)-3 = 0
-1 = 0
t belongs to the empty set
t belongs to the empty set
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