\"\"

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The expression is  \"\".

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Multiply the numerator and denominator by the conjugate \"\".

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\"\"

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\"\"  (Apply distributive property: \"\") 

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              \"\"                (Product of sum and difference property: \"\")

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\"\"              (Evaluate powers: \"\" and\"\" )

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\"\"              (Subtract: \"\")

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\"\".

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\"\"

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\"\".