$\"\"$

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The expression is $\"\"$ .

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Simplify the expression.

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$\"\"$ (Original expression)

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$\"\"$ (Multiply and divide with the $\"\"$ )

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$\"\"$ (Difference of squares property: $\"\"$ )

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$\"\"$ (Sum of square property: $\"\"$ )

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

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$\"\"$ (Add andSimplify)

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The simplified expression is $\"\"$ .

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$\"\"$

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$\"\"$ .