The function is $\"\"$ .

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

$\"\"$

$\"\"$ .

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

$\"\"$ .

Quotient rule of derivatives: $\"\"$ .

$\"\"$

Substitute $\"\"$ in second derivative of the function.

$\"\"$

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

$\"\"$

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