Originally posted by: basey_69
does that mean sasuke can also copy the rasengan?? or is that not really a jutsu and is just like some kinda chakra controlly thingy.
It's chakra control, not a jutsu (no hand seals are involved, and neither is taijutsu). While Sasuke might be able to see how it's done (and learn the theory behind it), he may not be able to actually use it; chances are that Kakashi may have seen the 4th use the rasengan (he seemed to recognise it straight away when Naruto used it at the hospital), but we've seen no indication of Kakashi being able to actually use it...

Besides, Sasuke's pride might prevent him from "recognising" the rasengan as equivalent/superior to the chidori (which would be suggested by using it), because of his rivalry with Naruto...