Hi.Can any one help me with these questions.They are really simple but i cannot seem to get them.Thanks

Q1.Show That:

http://i3.lulzimg.com/5b157758d4.gif

Q2.Prove that:

http://i3.lulzimg.com/1192859b6c.gif

Q3.Prove that:

http://i3.lulzimg.com/aca9108a7d.gif

Thanks a lot.