Question 124455
I think you may have left out a step!  Before you do ~(pvq), you need to do (pvq). (Note:   I have used dashes below for spacing!)


p q ~p ~q (pvq)  ~(pvq)
T -T - F - F  - T   -  F
T -F - F - T  - T -    F
F -T - T  -F -  T  -   F
F -F - T-  T - F   -  T


R^2