$\"\"$

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The functions are $\"\"$ .

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$\"open$

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

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ . $\"\"$

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$\"open$

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

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ . $\"\"$

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