\"\"

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The functions are \"\" and \"\".

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Find \"\".

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\"\"                     (Original function)

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\"\"              (Substitute \"\")

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\"\"                           (Simplify)

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Find \"\".

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\"\"                   (Substitute \"\")

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\"\"                           (Substitute \"\")

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\"\"                                    (Simplify)

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Therefore the value of \"\" is \"\".

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\"\"

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\"\".