$\"\"$

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The expression is $\"\"$ .

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Simplify the expression.

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$\"\"$ (Original expression)

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$\"\"$ (Sum of the squares: $\"\"$ )

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$\"\"$ (Evaluate powers)

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$\"\"$ (Multiply)

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

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$\"\"$ (Subtract: $\"\"$ )

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The simplified expression is $\"\"$ .

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$\"\"$

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$\"\"$ .