Prove that $ P \cup Q = Q$ and $P \cap Q = P$ if $P$ is a subset of $Q$

Prove that $ P \cup Q = Q$ and $P \cap Q = P$ if $P$ is a subset of $Q$

pWhen $P$ is a subset of $Q$, use logical connectives to/p blockquote ol
lipProve $P \cup Q = Q$./p/li lipProve $P \cap Q = P$./p/li /ol
/blockquote pI know that they are true, but I don't know how to use the
definitions of union and intersection in terms of logical connectives to
prove them./p pThanks in advance!/p