\"\"

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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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\"\"        (Product property of logarithm: \"\")

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\"\"       (Substitute: \"\")

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\"\"                       (Addition)

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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 \"\".