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The function is $\"\"$ .

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Replace $\"\"$ with $\"\"$ .

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$\"\"$

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Interchange the variables $\"\"$ and $\"\"$ ,

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$\"\"$

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$\"\"$

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Solve for $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Replace $\"\"$ with $\"\"$ .

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$\"\"$ .

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Check :

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ $\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .