$\"\"$

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The expresion is $\"\"$ .

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Find the square of a difference.

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$\"\"$ (Square of a difference)

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$\"\"$ (Simplify)

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

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

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$\"\"$ .

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$\"\"$

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$\"\"$ .