Hi
Since your formula has the form finding only will be hard.
In your other post, you used Applying this to your third or fourth line will allow you to conclude.
(What you did for line 4 line 5 is wrong)
Rewrite: and determine if its tautology, contradiction or neither. Using truth table I got neither.
My working out:






Now im a little stuck. After the truth table, im assuming I have to finish off with just a "p". Any help would be much appreciated.