$\"\"$

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The expression is $\"\"$ .

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$\"\"$ (Multiply numerator and denominator 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: $\"\"$ and substitute $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Simplify)

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$\"\"$ .

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Therefore, the simplified expression is $\"\"$ . $\"\"$

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$\"\"$ .