$\"\"$

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The function is $\"f$

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b) $\"h$

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$\"h$ ( $\"f$ )

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$\"h$ (Take out $\"x$ term)

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$\"h$ (Cancel common term nominator and denominator)

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$\"\"$

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$\"italic$ (Take limits)

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$\"italic$ (Proparty of limits)

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$\"italic$ (Simplify)

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$\"italic$ (Simplify)

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$\"italic$ (Simplify)

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$\"\"$

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Therefore $\"italic$ .