$\"\"$

The expression is $\"\"$ .

Evaluate the expression.

$\"\"$ (Original expression)

$\"\"$ (Let the logarithm equal $\"\"$ )

$\"\"$ (Logarithm formula: $\"\"$ if and only if $\"\"$ )

$\"\"$ (Substitute: $\"\"$ )

Equality for exponential functions property: $\"\"$ if and only if $\"\"$ .

$\"\"$ .

$\"\"$ (Substitute $\"\"$ )

Therefore, value of logarithmic expression is $\"\"$ .

$\"\"$

The value of logarithmic expression is $\"\"$ .