$\"\"$

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The composite function is $\"\"$ .

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

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$ .

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Let $\"\"$ then $\"\"$ .

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

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From the above conditions $\"\"$ lies in the first quadrant.

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$\"\"$ .

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$\"\"$

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$\"\"$

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Apply Pythagorean theorem:

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .