$\"\"$

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The expression is $\"\"$ .

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Evaluate the expression.

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$\"\"$ (Original expression)

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

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

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

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$\"\"$ (Definition of negative exponents: $\"\"$ )

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

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$\"\"$ .

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

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

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