Fill in the Blanks: (A) Given Sets $A$ And $B$ , to Prove That

Essay

Fill in the blanks: (a) Given sets $A$ and $B$ , to prove that $( A - B ) \cup ( A \cap B ) \subseteq A$ , we suppose that $x \in$ _____and we must show that $x \in$ _____
(b) By definition of union, to say that $x \in ( A - B ) \cup ( A \cap B )$ means that_____