$\"\"$

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

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Find $\"\"$ .

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$\"\"$ (Original function)

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

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$\"\"$ (Sum of squares: $\"\"$ )

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$\"\"$ (Simplify)

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

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

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Simplify)

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Therefore the value of $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$ .