$\"\"$

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The expression is $\"\"$ .

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Product of a sum and a difference: $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Evaluate powers: $\"\"$ )

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$\"\"$ . (Evaluate powers: $\"\"$ )

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The product of $\"\"$ $\"\"$ . $\"\"$

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The product of $\"\"$ $\"\"$ .