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Answer variants:
Verify \((A \cup B)' = A' \cap B'\) using Venn diagrams.
Proof:
\(A \cup B =\)
\((A \cup B)' =\) ---- (\(1\))
\(A' =\)
\(B' =\)
\(A' \cap B' =\) ---- (\(2\))
From equations (\(1\)) and (\(2\)), we have \((A \cup B)' = A' \cap B'\).
Hence, we proved.
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