Hello! I need help with these 3 problem. When I am doing the steps I need to add the laws i used. Here it is:

a.) Show that and are logically equivalent?

b.) Show that and are logically equivalent?

c.) Show that and are logically equivalent?

Heres the laws I need to use:

http://www.plu.edu/~sklarjk/245s07/logequiv.pdf