45. Show that ' ' is definable in terms of ' ' and ' ' by creating an expression logically equivalent to (PQ) that uses no other connectives than ' V ' and ' '. Expression (2 marks) 46. Show that ' ' is definable in terms of ' ' and ' ' by creating an expression logically equivalent to (PQ) that uses no other connectives than ' ' and ' '. Expression: (2 marks) 47. Show that ' ' is definable in terms of ' ' and ' ' by creating an expression logically equivalent to (PQ) that uses no other connectives than ' ' and ' '. Expression: (2 marks) 48. Show that ' ' is definable in terms of ' ' and ' ' by creating an expression logically equivalent to (PQ) that uses no other connectives than ' ' and ' '. Expression