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Proving identities of sets

Hello people!

I'm having a hard time with these few problems.

It's been ages since i've done anything with sets so I have pretty much forgotton everything.

I've been battling with these problems for 3 days now and to be honest haven't got nowhere so I'm pretty much in trouble since deadline for 'em is tomorrow :)

Any you guys could give a hand with these? Would really really appreciate it!

Ps. Sorry for bad english :)

Proof identity of sets;

(problems in attached image)