The following logical statement I need help proving (with a formal proof), WITHOUT using DeMorgan's. For some reason, I am unable to do so, and any help would be greatly appreciated!

~(P.Q) = (~P.~Q)

and

~(PvQ) = (~P.~Q)

(= is the tribar and . is the dot)

(the sooner the better! thanks for any help at all!)