$\"\"$

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The function is $\"\"$ .

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Apply the first derivative with respect to $\"\"$ .

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$\"\"$

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The derivative exponential rule.

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$\"\"$

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$\"\"$

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The first derivative is : $\"\"$ .

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Apply the second derivative with respect to $\"\"$ .

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$\"\"$

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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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Take out common term $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Add $\"\"$ to each side.

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$\"\"$

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$\"\"$ .

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$\"\"$

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Therefore $\"\"$ .