The function is $\"\"$ .

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Substitute $\"\"$ .

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Apply derivative on both sides.

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$\"\"$

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ (since $\"\"$ )

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$\"\"$

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We know that $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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We know that $\"\"$ then

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ , $\"\"$ and $\"\"$

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$\"\"$

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$\"\"$

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Therefore $\"\"$ .