When trying to kill the first T-REX get him on to rage when he hits against the wall (still on rage) go underneath his tail and shot him.Do not get him back on rage he will turn to bite you.you must keep on shooting him (still at the wall) or else he will turn you can stop for a bit before you have to shoot him again.
More tricks, tips and cheats for this game are right here - Tomb Raider: Anniversary cheats
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