\"\"

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The expression is  \"\".

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\"\"   (Multiply the numerator and denominator

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                                                                                  by the conjugate  \"\")

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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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\"\".