It is really easy. If there is a T in the column there MUST be a T in the column.
Problem: Using truth tables show that .
Work/Thoughts: I know that to show that to show that 2 sets are equal, the truth values will be the same. However attached is what I get for the two sets. Some of the truth values are different. Using this how would I conclude that a the first set is a subset of the second set?