Question: How to simplify an expression??

i have a long analytical expression, which i would like to strongly simplify. Unfortunately, i tried with simplify(%, size).... but this expr still remains long. I also tried with optimize(%,'tryhard') commands, which works pretty well, but i cannot control the assignments....t1,t2,..... How i can control the assigment procedure? Or probably i'm not considering some other commands which are able to reduce the size of a long expression!!! Cab you give references?? Tnx a lot. Paolo
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