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The function is $\"f$

a) $\"h$

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

$\"h$ (Take out x term)

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

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$\"italic$ (Take limits)

$\"italic$ (Proparty of limits)

$\"italic$ (Simplify)

$\"italic$ (Take x = $\"10$ )

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$\"italic$ .