The Function is $\"\"$

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$\"\"$

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Apply sum / difference rule of derivatives .

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$\"\"$

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First consider $\"\"$

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Multiply and divide each side by 8 .

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$\"\"$

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Using the formula $\"\"$

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$\"\"$

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Now Consider $\"\"$

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$\"\"$

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Let $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore $\"\"$ .