$\"\"$

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

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Find $\"\"$ .

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$\"\"$ (Composition of functions formula)

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

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$\"\"$ (Substitute again)

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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$\"\"$ (Composition of functions formula)

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

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$\"\"$ (Substitute again)

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$\"\"$ (Diffence of cube: $\"\"$ )

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$\"\"$ (Simplify)

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

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