$\"\"$

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The composite function is $\"\"$ .

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

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Substitute the functions $\"\"$ and $\"\"$ .

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$\"\"$

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

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$\"\"$ .

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$\"\"$

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Trigonometric ratio : $\"\"$ .

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Apply Pythagorean identity: $\"\"$ .

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$\"\"$ .

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Substitute the value $\"\"$ in above equation.

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$\"\"$

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$\"\"$

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The value of the expression $\"\"$ is $\"\"$ .