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D( t )
(t+2)^2 = 0
(t+2)^2 = 0
(t+2)^2 = 0
t+2 = 0 // - 2
t = -2
t in (-oo:-2) U (-2:+oo)
-33/((t+2)^2) = 0
t belongs to the empty set
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