The equation is $\"\"$ .

Differentiate on each side with respect to $\"\"$ .

$\"\"$

Differentiate on each side with respect to $\"\"$ .

$\"\"$

Substitute the value of $\"\"$ in the above equation.

$\"\"$

The value of $\"\"$ at $\"\"$ .

$\"\"$

The second derivative of a given function at $\"\"$ is $\"\"$ .