You have given good info with your question; more makes it easier to answer. Consider the following in future questions:
(1) Game type (ty for cash game info)
(2) Hand (ty for pre-flop info)
(3) Cards (ty for TT hole cards info)
(4) Position (early, mid or late)
(5) Stack (short or deep)
(6) How many players in the hand, and at the table
(7) Pot size as well as bet types (ty for 3 bet info)
(8) How your opponents play, if this applies only.
Anyhow, my answer: (short of more data!!!)
Best approach if 3 bet to you pre-flop in a cash game is fold. TT is not a strong hand to start with in a cash game, and more importantly --- a lot stronger
hands can present against you at showdown!!! I know that you are thinking about trips at the flop, but please do not chase trips at 3 bet preflop. Do not even think about it! That is your own hard-earned money. Think about that instead!!!