$\"\"$

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The expression is $\"\"$ .

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Multiply and divide first term with the conjugate of $\"\"$ and

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multiply and divide second term with the conjugate of $\"\"$ .

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$\"\"$

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Rewrite the expression.

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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$\"\"$ .