$\"\"$

The function is $\"\"$ at the point $\"\"$ .

$\"\"$

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

$\"\"$

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

$\"\"$

Therefore, the derivative of $\"\"$ at the point $\"\"$ is $\"\"$ .

$\"\"$

The derivative of $\"\"$ at the point $\"\"$ is $\"\"$ .