$\"\"$

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The functions are $\"\"$ .

\

$\"open$

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

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

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$\"open$

\

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

\

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

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$\"\"$

\

$\"\"$

\

$\"\"$ , so the functions are not inverse functions.