Thread: A proof =D

Let S,T be a subset of R^n. Show that ( SUT)' = S'UT'.
U is the union of S and T.

Some help with the above question would be greatly appreciated.

Ah... perhaps it would help if I mentioned that the above is a "derived set".

I am very distraught right now... this question is quite stressful and I am trying to solve this question to study for a test. Any quick help would be very helpful!