$\"\"$

The expression is $\"\"$ .

Apply change of base formula : $\"\"$ , where $\"\"$ .

$\"\"$

Again apply change of base formula : $\"\"$ , where $\"\"$ .

$\"\"$

Property of logarithmic function : $\"\"$ , where $\"\"$ .

$\"\"$ .

$\"\"$

The exact value of $\"\"$ is $\"\"$ .

$\"\"$

The exact value of $\"\"$ is $\"\"$ .