\"\"

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The expression is \"\".

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The logarithmic values are \"\" and \"\".

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Simplify the expression.

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\"\"                   (Original expression)

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\"\"               (Substitute: \"\")

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\"\"              (Power property of logarithms: \"\")

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\"\"              (Substitute: \"\")

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\"\"                     (Multiply)

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\"\".

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Therefore, approximate value of the expression is \"\".

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\"\"

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The approximate value of the expression is \"\".