$\"\"$

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The equation is $\"\"$ .

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Determine $\"\"$ at the point $\"\"$ .

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Substitute $\"\"$ in $\"\"$ to find $\"\"$ value.

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$\"\"$

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

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Consider $\"\"$ .

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Hence second derivative need to find at the point is $\"\"$ .

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Consider $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Find $\"\"$ at $\"\"$ :

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in above expression.

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$\"\"$

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Consider $\"\"$ .

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$\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Substitute $\"\"$ , $\"\"$ and $\"\"$ in above expression.

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$\"\"$

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$\"\"$

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$\"\"$ .