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Evaluate: `lim_(xrarra) (sqrt(x)-sqrt(a))/(x-a)`

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Evaluate: `lim_(xrarra) (sqrt(x)-sqrt(a))/(x-a)`
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`underset(xrarra)"lim"(sqrt(x)-sqrt(a))/((sqrt(x)-sqrt(a))(sqrt(x)+sqrt(a)))`
`=underset(xrarra)"lim"(1)/(sqrt(x)+sqrt(a))`
`=(1)/(sqrt(a)+sqrt(a))=(1)/(2sqrt(a))`
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