I've found it easy to defeat the T Rex at the last level by equipping the knife to enable
turok to run faster, and running to the far side of the of the area from which you
originally started to pick up the rocket launcher. You'll have to weave around the giant
crates in the courtyard to evade the t Rex, but once you reach the far side of the
courtyard there will be a rectangular giant crate that has the rocket launcher sitting on
the left side of it. To kill the T Rex quickly I suggest not using the automatic targeting
for the launcher, but simply blind fire until the T Rex falls on its side. Then equip the
knife, run up to the T Rex, and do the final killing move. Which is pressing the right
trigger button when the icon appears.

Arent there 2 T rexes? the bloody looking one that you kill and another one that you run
from on the level:Death Valley? And I thought you encounter one of them again..o_O

No there is no second t rex its a giganotosaurus [look up screens or vids] it is in death
valley only and can possibly be killed [rumors] but i wood just run away from it [Note:
watch it dismember raptors] and use the knife to run faster hope i helped answer your Q

Also the t-rex has 2 claws 1 eye and is brown Giga on the other hand has 3 claws 2 eyes
and is gray

I try to kill the t-rex but I get killed instead

thanks babe

lov ya