(i) With A ( (1, and B ( (2, Show that A B = ( if...

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(i) With A ( (1, and B ( (2, Show that A × B = ( if and only if at least one of A or B is equal to (.
(ii) With A1, A2 ( B2. Explain why the assumption that E1 and E2 are ≠ ( is essential.
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