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Using the identity \((a + b)(a - b) = a^2 - b^2\), find the following product.
(i) \((4 - mn)(mn + 4) =\)
(ii) \((6x + 7y)(6x - 7y) =\)
Answer variants:
\(16 - m^2n^2\)
\(36x^2 + 49y^2\)
\(16 + m^2n^2\)
\(36x^2 - 49y^2\)
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